Wow Red that LOOKS like I want to steal it...but I'll wait till you finish it.
I had the same problem with the tank when I had one. I used just about the same frame and there was just hardly no room left. On that type of bike that your building to bad you couldnt get a line made in brass and have one loop put in it. THat way at least it would flex and keep with the look your going for, which is damn sharp looking.
Terry