In the end I just didn't have the cash for the whole bike. I did have more than enough to buy the frame-set and I ordered it today!
I've customized my Xtracycle over the years and built it up just as I wanted. Once I got a chance to try the Dummy I could immediately feel how much stiffer it was and I've been lusting after one ever since.
A mechanic I know at my LBS took a look at my bike and thought that the parts were decent enough to start with and then I can slowly upgrade as they wear out. I did have another triple crank-set lying around that I am going to use instead of the one on my donor bike. I also am planning on rebuilding my rear wheel with a stronger rim and better spokes. Once that's done, I think I'll be set for some time.
I've already had someone ask to buy the Free-radical from me when I switch everything over. Since I plan on keeping the bars, bags, and board I'm not sure if there's much value in just the base piece, but I'd be willing to sell it to her. I may just keep the donor frame for now and as I upgrade parts I can throw the old ones back on it until I have a complete bike again.

The next big decision was what size to go with. I have a 32" inseam and ride either a 54 or a 56- depending upon how the frame is measured. I was more concerned with a more upright ride than stand over height. I have this goofy neck injury from playing underwater hockey, and need something more upright than your standard road bike. I ended up going with the 18" frame and am hoping that will be a better choice than the 20".

Jon