Called Fritz's Muffler in San Marcos, TX and told them what I was looking to do, they said "No problem as long as the frame is steel, $20." Woohoo! I mounted the motor using the rear mount only, then cut down my old Cranny seat post with a jigsaw and fine tuned it with the Dremel to make a tight press fit.
The welder and his buddies were very interested in the project and had lots of questions! He did an ok job, but it should clean up well. Time to get to sanding!
A pic without the mount:
A pic with the mount press fit:
And a pic after getting it welded: