I dont have a build thread as such mate. it just evolved over a fairly long period of trial and error.
The real key IMO is the head. RB heads have an inherent flow mismatch between between the inlet and the exhaust. The inlet flows almost twice the exhaust side and anything you can do to even it up helps immensely.
Porting by a competent porter, valve size, cam selection all play a part. Get it right and the rb will ooze power.