I saw this post over at Rimfire Central on installing Sling Studs on that type of Hollow Factory Stock..
http://www.rimfirecentral.com/forums/sh ... p?t=305665
I would imagine that with the propper type of hinge + latch & Epoxy anything is possible, As you can see from the pics in that thread I linked you too, There's alot of room in there for a AR-15 Cleaning Kit, Weights etc..
My factory Synthetic Stock was made Earlier & it"s Solid & haven't ever thought of trying to remove the butt pad on it.. Might be solid ?? Don't want to ruin it..
Good Luck with any "MODS" You try an undertake
BTW WELCOME TO THE FORUM YANK
Always good to see new people showing up..