I recently built a 4m "2V" geodesic dome on a 20degree tilted base at a local elementary school. It was well received and everybody thought it was spectacular..... except me!
The triangle grid and the way the scenes "folded" as they crossed from triangle to triangle seriously undermined the experience. Sadly, we remain severely budget limited at the present time so an inflatable Go-Dome or a fiberglass one from Astro-Tec are not possible "right now".
I am considering DIY alternatives involving polycarbonate "gores" and fiberglass for rigidity. I would use plywood strips on-edge to provide the skeleton, a roll of polycarbonate to make gores for the skin, and then coat the dome with fiberglass to provide structure. Depending upon whether or not I have to transport it I would do the complete dome or break it into quarters.
Aside from the roll of polycarbonate (which I think I can get from an industry contact) most of the materials should be with the realm of a DIY project. There are few locations with sufficient ceiling height. Depending upon community support I might shoot for a small structure near the school.
I am confident that I will have PLENTY of skilled volunteer labor. The challenge has been to find materials and components that will not break the bank. Unfortunately, that has translated into disqualifying any major components.
I welcome feedback and insight on the proposed design and recommendations on size. We are still in the "dream" phase so there is plenty of time to change the plan.