Ran into this while i was looking at doing a parts guitar.
perleguitars001 | eBay
Huge assortment of oddball bodies, neck pocket routes, pickup configs, hybrid bodies...Mainly poplar but you can ask for other woods as well. All you'd need to do is find someone to finish it, and you're well on the way to a custom.
Yeah I've seen the parts he puts on ebay, tried to get a Alder body routed like a JPM but with a OFR Bridge, they wouldn't do the OFR