A year and a half ago, Grinhill posted his first RC build (March 2009). He later went to a bigger motor (63mm) which I have copied (Thanks, G!). Although...I have always liked the way he used the brake mount bosses as a attachment point for the motor on his first one.http://endless-sphere.com/forums/viewtopic.php?f=28&t=9172#p141788
By adding longer bolts and an intermediate friction-nut as a divider, you can still have brakes on those points, with the mount slid under them. The problem it addresses is that bike frames have a wide variety of shapes. This causes a problem when someone wants to build a copy of a successful drive, but the bike he has (or most wants) is a shape that restricts certain drive configurations.
As luck would have it, I already have a hardtail DH-frame with a low top-bar. After seeing Todds build, I would have bought one if I didn't already have one. Regardless of frame geometry, the relationship between the common brake types and the tire are very consistent, with only a tiny amount of adjustment needed for any drive thats attached there.
Looks Good Drifter!
edit: you have prompted me to finish my "volt/kV/roller diameter/speed" chart:http://endless-sphere.com/forums/viewtopic.php?f=28&t=21365&p=326424#p326424