With the front suspension unloaded, I was able to flip the exhaust to work it over the axle, and slide it out the front of the frame. The bolts at the muffler flange are rust-siezed, so I plan to grind the heads off, soak them in penetrant for a week, and then extract them.

I plan to remove most of the usable frame brackets by grinding the rivet heads off & air-hammering the rivets through.
After that, I'll cut up the frame & scrap it.