the routing is included in that price from what i understand. they do that for you.
i can't think of any right off hand. but A LOT of what you need to know will be setup.
assembly is fairly straightforward if you by parts already ready to go (holes drilled and all) usa custom guitars bodies generally come with the bridge mounting holes drilled and the neck mounting holes drilled as well. so if you got a neck that had the holes already drilled in it you wouldn't have to drill those either. just bolt it on and make sure it fits tight. other than that, there's installing the tuners and string nut work and other setup related things. i don't know of any specific links related to assembly but i'm sure if you do a search on yahoo or something you could find some. maybe
www.projectguitar.com has some articles on that..
as far as finishing goes, check out:
www.reranch.com lots of free info there..
i do basically all of my work with a hand drill, sandpaper, screwdrivers, and allen wrenches...