Have sent you a PM. Long story short, this is still in the prototype phase. As you can see I'm about to make a hilarious stuff-up, so I want to be much more happy with the design before I make them for others!
For the P2 prototype I made an insert inside the stock around the sling stud area, for exactly this reason. Unfortunately I rushed, really and it's poking through a little bit, but that's an easy fix for P3:
Test fitting of the action went pretty well - because of the large step size I specified getting the parts cut (to reduce time & cost) they still needed quite a bit of hand-fitting.
Measured twice and cut once doesn't really work if you measure the wrong thing:
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