Mounting Ideas for Difficult Frame

X, I fear my posts are generally becoming negative!

Never-the-less, things are what they are.

Aluminum is NOT a good choice for frame material because it shall crack from fatigue.
It's only a matter of WHEN that will occur.

From time to time there are MSM articles about spectacular structural failures in aircraft.

If you still wish to proceed on your project it would be advantageous to have a reasonable supply of stock on hand to select from, and a tig welder.

Good luck!
With a bit of work you could have a really kool liteweight racer!
rc

Other then being aluminum, I don't see too much of a problem. Mounts can be made if OEM mounts won't. I'd if I used it (which I wouldn't), put copper or steel shims where the engine clamps on. Both front and rear mounts can be made to fit. Other then that...I like the bike.

Some ideas....

why we do not use aluminum frames

wow I have seen aluminum crack in many places but not normaly right through the welds like that ! did it go completely around the bottom bracket?

Friction drive might fit depending on the seat clearance of the seat stay brace and the tire