The 20 ft 2 x 4 Garden Dome 2 + Base Option with the "X1A" subdivision is illustrated with rough-in framing for a standard size (36" x 82") door.
It will make a great greenhouse, cabin, workshop, storage shed, etc. The Cupola option will work well.
In this example diameter across is 20 ft. and height is 15 ft.- 9 inches.
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