Built for $2100 and change, and easily broken down and transported. [Rig Some Light]
It is 18 feet wide at the widest point and about 13 feet tall. It feels very spacious for it's 209 square foot floor. The dome shell is built out of 3/16" corrugated plastic and 3/4" blueboard foam insulation. The shell of the dome is a basically a foam board insulation sandwich. There is an outer plastic dome, two layers of tightly fitted blueboard insulation and then an inner plastic dome. It's all held together with bolts that bolt through all the layers. The shell of the dome is about 2 1/2 inches thick.