Only one comment. I appears that a rear brake caliper will not fit on the brake bridge. It appears that it will hit the seat stays before seating on the bridge.
One more thing on material. Have your worked out any numbers on tube OD verse wall thickness? Also, do you plan to buy the tube set from a supplier or are you planning to form those seat and chain stays yourself?
Other than that it looks like a good first swag....keep refinning it before cutting material.
Best Regards,
Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
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NVIDIA Quadro FX 1400
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Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.