Looks great. Would you be able to mfg a bracket that ties the bottom and top bracket together as a single unit. I see you have the axle clearance issue to deal with so maybe not.

I've done the 12" conversion using Camaro rotors and PBR calipers on a 67 Lemans and 58 Chevy. With both of those I was able to mfg the bracket out of a single piece.

Jason
1946 GMC COE
1967 Pontiac Lemans Convertible

http://s1275.photobucket.com/user/jrpontiac/library/?sort=3&page=1