My tank arrived today, along with a couple other boring parts like a carb kit and battery. I mocked it up to see how it will fit, and it looks like it will be close enough to work!
Hoping that the forks will show up soon, then I can start putting this thing back into some semblance of a motorcycle. I still have to figure out a seat arrangement, I was thinking about using one of those sprung saddles, or just a flat bench seat. I definitely think I'm going to have to modify the frame a bit to get rid of the "chopper dip," probably just cut out the top of the rear triangle and weld in straight tubing to make things flat there.