(63 days until the 2011 WHPSC)
I cut the chainstay arch out of the mockup bike frame in order to move the wheel closer to the bottom bracket.
Since this is just a fixture that will never actually be ridden, I kludged a couple of brackets rather than shorten the chainstays.
Since it would be impractical to have my legs surgically lengthened, I concluded that a 700c front wheel is too big. The floorboard also needs to be lowered.
I made a facsimile of a 650c wheel out of recycled OSB sheathing from my spa renovation.
The verdict: a 650c wheel provides sufficient clearance - not a lot of clearance, but enough.