You might, and I emphasize MIGHT, check craigslist and see if there's a shop or person that works on the older vintage bikes. Let them know what you've done, ask them for a labor rate, their best guess on how long it will take to reassemble, and if you're allowed to help to save some labor costs. My guess would be most BIG shops would charge 50-100/hour, and a self-employed person might charge 20-30/hour.
Your labor on your own bike in your own garage is free, assuming you're willing to get dirty, read a book or two, and have the time to devote to it. I agree: it IS immensely satisfying when you get all those parts together, all painted up and clean, and seeing it fire up and run.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.