While trolling around the Mosrite forum, looking for truss rod advice, I found out about a guy in Canada who bought the left over stock from Mosrite when they went belly up. Turns out he doesn't have many bass parts, but he has lots of NOS and unfinished guitar bodies and some necks too, I believe.
I was able to buy a NOS bass body, pickguard and a couple genuine knobs. So, my thought is to build a 1 pickup Mosie bass and I've at least got a real neck I can copy for it. The only tough part is the bridge and those goofey tuners, but you never know what might pop up on eBay!
I'll post pics when the stuff gets here.