Super job guys! @Tim
Look at skate board wheels for the tank blocks. Not my idea but one I stole from a friend. He cut skate board wheels in half and used them to raise his tank on a frame with a similar backbone.
We used some threaded bungs on top of the frame to provide a bit of lift, and make the fabrication easier. Originally the plan was to drill the frame tube and use these skinny blind bungs, but getting the position and angle exactly right would have been a challenge and once you drill the frame, it's drilled. These could be ground off if needed in the future.
Anyhow - so I have 3/4" or so high threaded bungs on the frame and I'll get some rubber like tank mounts or something, drill them to match the bung and shape them to mate with the curved tank tabs. Then cinch it all down with the bolts and maybe a dab of blue Loctite.
One of the next challenges is finding a matching kickstand for this weld-on mount. The one I had turned out to not be a match, and we think it's likely a Harley mount. I have a line on a cheap stand that I hope will fit but if anyone has a kickstand around with a 1/2" clevis top on it, let me know