Incredibly cool project, jar944! I did something fairly similar years back with a KTM 550, but rather than swap frames, I just modernized the suspension, body work, and just about everything else. That 550 mill was a beast. I really wish I hadn't parted with that bike now, but such is life. I'm having fun living vicariously through your thread!
Here's a pic of my old girl (let me know if you want me to remove the photo if you find it disruptive).
Thanks for the great read!