I'm contemplating building a geodesic dome gym out of 1" galvanized steel pipe (the kind used for plumbing). There are several sites on the web that describe building geodesic domes out of pipes ( many of the domes are used for Burning Man). Most of those domes are made using either 1" - 2" diameter galvanized electrical conduit or PVC. Although conduit can be quite strong (strong enough to support human weight), I don't think it would be strong enough to support jolting forces, particularly from large heavy weights. Therefore, I'd like to use steel pipe. However, the hubs used for conduit framed domes are formed by smashing the ends of the tube flat, and drilling a hole through it. I don't think that would be practical with 1" steel pipe (although I may be wrong). A fairly extensive search of the web doesn't reveal any sources of hubs appropriate for steel pipe geodesic domes -- anyone have any suggestions?