In the seattle area there are 2 shops, maybe 3 that can help you out:
Patrick's Fly Shop is the only shop in the city that actually has information and the parts to build a rod, but they are limited in scope.
Up in Lake Stevens is a good spot: Greg's Custom Rods. He can help you out and set you up to build the rod of your dreams. Its a funky little shop packed with rod building equipment. http://www.gregscustomrods.com/
Patrick's in Seattle has rod building classes. The shop people have been very helpful when I have visited and had questions. THey have the best hours in town, too. I think they are open 'til 7 and even open all weekend. It is a pretty small shop, though.