Would be basically the same frame Brian, just with some 'updates', and much lighter. Want to be able to move everything over, and just bolt it on. May happen, may not, will depend on the $'s involved.
Agree with your points on a seat re-contour. One of the 'updates' is to lower the knee trays (get more 'in, than 'on'), so a new seat will be needed anyway. I also need to move the bar/grip position back to take stress off my back/shoulders. Thinking of going to a more vertical grip position (like modern F1/2's), and may try a thumb throttle.
I'm getting to much front end lift under hard braking. Need to sort that out as it's causing too much trail change, and the front wheel to lock. Think it has to do with the brake caliper mounting(s).