RT,
Some great pictures. I'e eyed off this frame from Demons cycles in the US, would be a great start to a project:
http://cgi.ebay.com/ebaymotors/CHOPPER-ROLLING-CHASSIS-SPORTSTER-FRAME-4-HARLEY-MOTOR_W0QQcmdZViewItemQQcategoryZ35562QQihZ014QQitemZ330108527739