Figured that I'd update with new pictures!
Didn't do much new, put together a 12 gram dropout stock, need to cut it down the tube to where the front of the CAR stock is so it'll be shorter.
There's a threaded rod going through that you can't see, a lock nut on the dropout side and a normal nut on the other. Still need to figure out how to get it to stay tight, but still allow the changer to rotate while keeping the stock in place. Might be impossible but it's not a huge pain to rotate the whole thing.
Accidentally chopped off the rear of the stock, but you can get the main idea.