Thanks for the reply on the seat options. I really don't want to get into cutting the frame. I guess perhaps at some point I'll consider it, but I'm gonna look at my options for seats. Here are a couple that are my top two choices. **at the moment.**
http://www.motorcycleseatsdirect.com/1979-1981-Honda-cb750k-cb750-k-cafe-motorcycle-seat-metal-pan/
http://www.hotwingglass.com/seats/dark-wing.shtml
By measurement, they are both viable options. I'm leaning toward the first seat, if they can do a couple of small things to it-- shortening the tail length so it doesn't stick out so far over the rear fender, like the stock seatpan does.
The second seat is pretty easy to work with, and I could see that working just fine on that frame. The measurements are darned near perfect for an off the rack seat pan.
Just sharing. Perhaps some of you hadn't had the chance to see those two vendors before.
Loudest143