Update:
Wound up with a bit of function over form here, I picked up a g36 red dot/laser combo and a riser for it. After some zeroing it works phenomenally.
Grabbed a couple of RPK-length mags. AK's seem to be the only AR I can stand to see extended mags for.
I'm considering picking up a couple more external parts, in particular a 104-style gas tube front sight and a lug where the stock fs used to be, to hold the rod in place.