You're idea is good swampcrawler. There are a number of good sources for Doug Fir shafts here, but as i've been making up my own for a number of years, and the two arrow smiths I bought from aren't active any more, I'm a little light on sources for you. Raptor archery and Elite Arrows come to mind. Lost Nation may be able to help you out; not sure on that one.
Figure out your spine and length with a purchased set or two, acquire a few basic tools, and have at it yourself after that if you're inclined. I'm glad to have taken that route, and also good to know their are arrow builders out there to help when needed.