Such a set is very interested idea.
BUT. For what?
If you will offer the complete set - it will give customers an opportunity to bash exact needed body and other parts would be unclaimed. So there will be some parts to overpay for them. Like neck-less chest plate or common arms. I don't know... Really, bushing or customizing figure I'm barely dissassembling it in future, so it would be fine to get only parts that you need for the current figure. Honestly, we do really need chests with solid necks on the narrow\advanced TT. Coz on the musculars there is some solid neck already.
That's my thoughts about it.