Well I've "done it", not just close but did it, then had to sell my supercharger. The illness in the family is still there and I need to get past Christmas before I start the rebuild. Until then I'll have a few more parts to sell off as I need the cash. When I return, I plan on building a turbo. If corky's is here by then, I'll buy the base and go to my own version of a stage III. If not, l'll build my own as fast as I can afford to buy the parts.
The tuning isn't all that hard once you figure it out. It also wouldn't be anything with the right tools and/or business relationships. The only thing holding up a turbo for the limited is the market. Nothing else, there is no magic here.