Greetings!  if I were getting into Redcaps, I'd get my stock from Sand Hill.  As far as I know, there aren't any breeders hiding stock away.  The Sand Hill stock is probably going to be the best.  I'd have the goal of having three breeding pairs after the fisrt hatch.  The following year, I'd hatch really heavy and cull a lot at 8 weeks for weight.  I'd set the barameter to the upper 25% or 20% in weight, and run several hatches to get a minimum number in that weight category per pair.  As they develop I'd follow type.  
These birds are in desperate need of a hero.