Here's is the question you should ask yourselves: Why would we spend all of this time and effort replicating an existing shell, when we have plenty of talented artists and 3D modelers in this community who are capable of designing /exactly/ what we want?
Also a legitimate question. Frankly, with all these letter-blasters floating about, we've got whatever we want. Well, almost whatever we want *Nudges Aeromech about releasing files*
TBH though, it's a *pain* to model an accurate shape that then also has great ergonomics. I was planning to try to use 123d or something similar to copy an existing handle we all know and love, then drop a catch & trigger into it and use it on homemades. Maybe a maverick or TTG.