Question: What material is the structure that the Jamesway hut is a variation on?

Context paragraphs:
Jamesway hut: The Jamesway hut is a portable and easy-to-assemble hut, designed for arctic weather conditions.  This version of the Quonset hut was created by James Manufacturing Company of Fort Atkinson, Wisconsin.  A Jamesway hut had wooden ribs and an insulated fabric covering for the Army Air Corps.  Insulated blankets in 1.2 m (3 ft 11 in)-wide lengths were made with glass fiber insulation faced with flame-proof muslin and enclosed in plastic-treated cotton that was water-, vermin-, and fire-proof.  The hardware (nails, fasteners, and connecting bars) was the only metal component.  The whole package weighed 540 kg (1,190 lb) for a 5 metres (16 ft)-square hut.  Its wooden packing crates were designed for reuse as the hut floor.

Weatherport hut: Weatherport huts are portable and relatively easy to assemble metal-framed, fabric-covered structures that are somewhat similar to the quonset-style Jamesway hut of the early 1940s.  Weatherport huts were originally developed by Clayton H. “Sweede” Hansen in Gunnison, Colorado in 1968.  Hansen wanted a durable structure that could protect his vehicles from the harsh Colorado winters.  Dissatisfied with the available products on the market at the time, Hansen decided to create his own design.  The shelter worked better than other products on the market and a family business was born.

Abbot Pass hut: The Abbot Pass hut is an alpine hut located at an altitude of 2925 metres (9,598 feet) in Abbot Pass in the Rocky Mountains in Alberta, Canada.  It is nestled between Mount Victoria and Mount Lefroy, straddling the continental divide, which, in this region, defines the boundary between Banff National Park in Alberta and Yoho National Park in British Columbia.  While close to the border, the hut lies entirely in Banff National Park, and is the second-highest permanently habitable structure in Canada (after the Neil Colgan Hut).  The hut is maintained by the Alpine Club of Canada.

Dutchess Mall: Dutchess Mall was an enclosed shopping mall in Fishkill, New York, United States.  The mall was demolished save for the old Jamesway and Service Merchandise buildings.  Currently, the former mall property is the site of a Home Depot, as well as the former Service Merchandise that has been gutted and now awaiting future use, with the Dutchess Marketplace Flea Market in the former Jamesway, and the rest of the property awaiting further redevelopment.  Dagar Group manages the shopping center.  R.C. Chera Realty Group is the exclusive leasing broker for the existing vacant structure.

Cosmiques Hut: The Cosmiques Hut (French: "Refuge des Cosmiques") is a mountain hut in the Mont Blanc massif in the French Alps at an altitude of 3,613 m.  It is a large structure capable of accommodating 148 mountaineers.  It was constructed in 1990 on a rock promontory situated between the Col du Midi and the base of the Cosmiques Arête which descends southwards from the Aiguille du Midi.  It gives access to a number of classic alpine mountaineering routes, and has proved to be extremely popular with mountaineers, so much so that in the summer months prior booking a few days beforehand is essential in order to secure a bed.  The Hut is wardened between mid-February and mid-October.  In winter the nearby Abri Simond Hut is left unlocked, although this has no cooking facilities, heating or water.

Structural variation: Structural variation (also genomic structural variation) is the variation in structure of an organism's chromosome.  It consists of many kinds of variation in the genome of one species, and usually includes microscopic and submicroscopic types, such as deletions, duplications, copy-number variants, insertions, inversions and translocations.  Typically a structure variation affects a sequence length about 1Kb to 3Mb, which is larger than SNPs and smaller than chromosome abnormality (though the definitions have some overlap).  The definition of structural variation does not imply anything about frequency or phenotypical effects.  Many structural variants are associated with genetic diseases, however many are not.  Recent research about SVs indicates that SVs are more difficult to detect than SNPs.  Approximately 13% of the human genome are defined as structurally variant in the normal population, and there are at least 240 genes that exist as homozygous deletion polymorphisms in human populations, suggesting these genes are dispensable in humans.  Rapidly accumulating evidence indicates that structural variations can comprise millions of nucleotides of heterogeneity within every genome, and are likely to make an important contribution to human diversity and disease susceptibility.

List of commercially available roofing material: Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure.  A building's roofing material provides shelter from the natural elements.  The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting structure.  Those types of roofing material which are commercially available range from natural products such as thatch and slate to commercially produced products such as tiles and polycarbonate sheeting.  Roofing materials may be placed on top of a secondary water-resistant material called underlayment.

Quonset hut: A Quonset hut is a lightweight prefabricated structure of corrugated galvanized steel having a semicircular cross-section.  Developed in the United States, the design was based on the Nissen hut introduced by the British during World War I.  Hundreds of thousands were produced during World War II and military surplus was sold to the public.  The name comes from their site of first manufacture, Quonset Point, at the Davisville Naval Construction Battalion Center in Davisville (a village located within the town of North Kingstown, Rhode Island, U.S.).

HutP: HutP (Histidine utilizing Protein) is one of the anti-terminator proteins of "Bacillus subtilis", which is responsible for regulating the expression of the hut structural genes of this organism in response to changes in the intracellular levels of L-histidine and divalent metal ions.  In the hut operon, HutP is located just downstream from the promoter, while the five other subsequent structural genes, hutH, hutU, hutI, hutG and hutM, are positioned far downstream from the promoter.  In the presence of L-histidine and divalent metal ions, HutP binds to the nascent hut mRNA leader transcript.  This allows the anti-terminator to form, thereby preventing the formation of the terminator and permitting transcriptional read-through into the hut structural genes.  In the absence of L-histidine and divalent metal ions or both, HutP does not bind to the hut mRNA, thus allowing the formation of a stem loop terminator structure within the nucleotide sequence located between the hutP and structural genes.

Microstructure: Microstructure is the very small scale structure of a material, defined as the structure of a prepared surface of material as revealed by a microscope above 25× magnification.  The microstructure of a material (such as metals, polymers, ceramics or composites) can strongly influence physical properties such as strength, toughness, ductility, hardness, corrosion resistance, high/low temperature behavior or wear resistance.  These properties in turn govern the application of these materials in industrial practice.  Microstructure at scales smaller than can be viewed with optical microscopes is often called nanostructure, while the structure in which individual atoms are arranged is known as crystal structure.  The nanostructure of biological specimens is referred to as ultrastructure.  A microstructure’s influence on the mechanical and physical properties of a material is primarily governed by the different defects present or absent of the structure.  These defects can take many forms but the primary ones are the pores.  Even if those pores play a very important role in the definition of the characteristics of a material, so does its composition.  In fact, for many materials, different phases can exist at the same time.  These phases have different properties and if managed correctly, can prevent the fracture of the material.

Supporting paragraphs: Jamesway hut Quonset hut
Answer: corrugated galvanized steel