I found my Dyson vacuum cleaner with fine filters useful, both to clean up after working and to remove the ultra-fine sanding dust left by 1000 grade papers from the surface of the wood. As it was summer, I did heavy sanding outdoors. I only worked in the evenings and for three weekends, and spent roughly 40 hours in total building the guitar. Most of the strut and tone bar shaping is already machined, the soundhole is precut and the rosette rebated. The side ribs are pre-bent, so you don't need a steam bending jig.
All structural blocks are precut.
You're working just like a real Martin luthier, starting not with the raw innards of a tree, but with a machine-cut blank that you finish by hand. You can reshape, carve and adjust all the parts as you wish. The back is given its belly during final assembly, by sheer force. This seemed the least well-engineered aspect of the guitar, but the wood glue is capable of standing the considerable tension and nothing went out of shape as a result. Martin's instruction suggest doing this before fitting the top.