This link will take you to a geodesic star pattern grid work which beautifully adapts to a dome form . Above is a quick CAD construction of a split donut cage design. Doors windows and scales are left to the imagination of the viewer. Wall sections are shown which can be sand molded on the ground. These undulations also serve to stabilize the wall sections as thy are raised into place.
All large surfaces have a slight ribbing to add strength at joining edges.
The main span is 20 ft. Sand casting methods from ancient tech apply. Adding more weight would require a bigger backhoe and stronger saftey measures. The total for a 20 X 20 ft building with wall at back, garage door openings at front could be as little as 120 cu ft., per inch of thicckness. Above is a basket weav , great circle, lamella cage, mostly in yellow.