What Bike For my First Build?

yep,
ebay is where there at. there on craiglist.org also but those on craigslist are expensive, because they are usually already on a bike.

Looks like you have plenty of room on that bike

Here is a small list of vendors ...... http://motorbicycling.com/f3/find-dealer-review-1730.html

yeah I've used a GT Tequesta, and a Skykomish. I have 5200 miles on my GT (the 43' Messinger), and the Skykomish was a good instal too. the bigger front UBolt setup was used to mount the front of the motor (Bigger tube).That one in the picture is a fast and reliable build. only thing you'll probably be mounting the sprocket directly to the spokes but like I said 5200 miles and 4200 miles before I put a new rear wheel on it(39 dollars). I ride it like a mmotorcycle off road. THis one also has enough power to start with only the clutch even on hills . The spoke problems come from the chain tensioner on your build without drilling a hole through it ..if needed.