I'm building my own too. I've got the frame on order and the wheels are getting powdercoated. I've got a buddy out trolling the waters for a motor (shovelhead). Fabrication should start late Feb with final assembly sometime in late March. This is all happening in my garage, BTW, except for the powdercoating...
Anyway, it'll be based on a roller from these guys:
http://www.sinwear.us/SuckerPunchSallysChopper.html
Old School rules. Don't buy one of those girly-man wannabe billet barges.