Someone asked me the other day if it was possible to build a dome that only had one size triangle frame, it is possible but I had to cheat a bit and design a dome with two mirror image triangle frames. They are technically the same size so I reckon it counts. The sphere has 120 frames which I think is the maximum you can have with only one frame shape. A 2v dome has 40 triangle frames of two types, this dome has 60 frames all the same. If you want plans for this drop a comment below.
Visit www.geo-dome.co.uk for more info and other geodesic dome plans.