ok...let me start off by wiping the drool off my chin... that's going to be a great bike when your finished. Here's my 2 cents about color scheme... While it's true that alot of bikes in the 70's had the big metal flake candy colors, not many were on the race bikes...the more I look at it, I'm not sure if a big metal flake paint would fit it...would definitely depend on the color... about the gray color - that thing is to monstorous and cool to have a paint color like gray...gray just doesn't have the FLASH that your tank & cowl has... I'd pick a big bright color - honda red w/ the bare metal knee dents would be cool, or something along those lines... If you really wanted some bling, you could polish the tank....it is aluminum - that would be crazy cool - you can clear over it (it can be done, my buddy does it all the time)..... Don't get me started on colors for bikes...
It's hard to go wrong with black...almost anything looks good in black. What if you tried an ivory (kinda like the old racing whites of ford wimbleton white?) and put some dark blue racing stripes down the tank ? or vice versa... you have access to photoshop?
If you have some good res. shots of the sides and 3/4 angles I could whip you up something to look at if you like.
keep posting the pics.