Well, fixed the gas leak and rode her on home last night. Turns out some of the gunk from the tank was preventing the #1 carb drain screw from fully seating. Now she runs like a top and doesn't leak gas, so it's time for the fun.
As far as my plans go, I could easily go the cafe route with this bike, it's begging for it actually. Problem is, I can't ride it if I did that to it, the old back just wouldn't be able to take the riding position. So an upright style is needed, plus going the flattrack route will cut off a lot of weight, which will make it easier for me to get this thing on the centerstand if need be.
I've done some searching, and the tank I want to use has a 3" channel at it's narrowest point...I'll need some more detailed measurements, but I might not need to modify the frame at all, other than tank/seat mounting concerns and of course the standard taking off bracketry and such.
I'm still trying to figure out how to get an equal-length 4-into-2 single side exhaust...unless I go ahead and pair off the cylinders at the head, which would make it much easier. Anyone have an idea of how to accomplish this?