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Another thought.
A good way to visualize a space frame is with every joint replaced with a ball joint. A true (fully triangulated) space frame will maintain integrity under this condition (whereas a rectangular shape will just collapse -- lozenge). No tube should be subjected to a bending or cantilever load.
Torsional rigidity is critical. Even in well-engineered bikes, this does not always happen right. We moved to a 550 from our 350, and with suitable mods, it was faster. The stock 550 would wobble, however, and seemed to be perhaps sensitive to certain front tires. I reinforced the steering head area on ours and apparently cured the problem... although I'm not convinced that my gut level feel was actually the right thing to do -- I didn't use FEA or any of that kind of thing.
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