Thanks for the encouragement. I think I'm going to follow the John Allen process since my anticipated stoker and I are pretty close in size. Althought that method requires a little more work I think the result will be a little more useful. I also have ready access to 4130 tubing (there's an aircraft/motorsports metals supplier nearby) so I may go for a whole new lateral or boom tube if the salvaged bike process seems to present too many headaches.
I'm hunting down a suitable front donor frame at the moment, but this looks like a project that's actually going to go somewhere. I'll try to document the process and post pictures.