John,
I envy you. The Black Bomber was my favorite restoration project of all.
1) There are hundreds of parts available for it still through Honda.
2) There are 3 suppliers in the US who will likely have it if your local dealer can't help you.
3) There are some parts you ain't going to find anywhere. Seat hinges are one such item, stock rear sprockets are one, stock exhaust is another.
As Raul said, go get your hands on it as quick as you can. They are valuable and I firmly believe that if done with NOS parts and done nicely, you are making a sound investment. I feel sorry for the guy doing one 2-3 years from now. I literally worked with over 20 sources for almost 1 year and no budget for parts and still had to spend over $5,000 in getting a tool maker to custom fabricate 25 sets of seat hinges and 15 pairs of fork trims.
Once you're done, there is satisfaction that few more in the world can be done - parts are drying up that quick.
When you have it and are ready, you can post or PM and I'll help you with information. I will not make a public post.
Regards,
Gordon