OK, the size a 2v geodesic sphere WANTS to be, from 10' human materials (1" EMT minimum suggested) is a bit smaller than a 20' diameter. The best I could get away with would actually be from 600' of EMT with a 16.746' (16' 9") diameter. The cut should be made 68.588" from one side or 54.912" from the other side of the 10' sticks. That means that from 60 sticks, you should be able to make 6 well measured cuts with a 14" chop saw on 10-packs of tubings, and get 120 perfectly sized units (accounting hub/bolt hole centered @ 3/4" from the end of each piece). If you can happen to get a slightly heavier pipe (diameter or wall thickness), 12' sections would give you a diameter of 20.1" or so (ask me for new numbers as it's not just a scalar, but a scalar and constant to make it just right), but unless you want to use 25% more pieces of pipe, you're stuck with a diameter of 16'9" for scrapless materials fabrication. It's not me, it's what the dome wants. A 16.746' diameter domes offers only dust scraps and metal shards for the saw table to blow off of itself. That's what I meant by knowing my size as the very last thing about a dome, as I let my material lengths dictate that. I once designed a ~54' diameter 7-frequency that would have used 97% of it's materials, leaving only a small bucket of scraps from 700 individual pieces (that sort of thing's almost worth a few hours of MADNESS). Lemmeno if I can help again.

Words and Pieces,
Brennon