I get my wood from a local timber yard (Yandals). there isn't so much alder there though, you gotta be quite luck on that, but I prefere other woods anyway such as poplar, maple/birdseye, sepelle.
yea it defininately is a mission, there are times when you hate it (e.g. router catches and destroys a humbucker rout), and times when you love it (the body has just been cut and routed and is starting to look like a proper guitar).
Actually though Ive been very tempted to get some parts made for me as sometimes I don't have some of the tools or patience to do a really top-notch job and Feline guitars have some very reasonable prices for brilliant craftmanship, i don't know about the other two as I havn't researched their stuff yet.
MMM