Thanks to Matthias, we have only one thing remaining for MrC/SC builds that is not working (as far as the build itself is concerned), and that is the translators. And you can just comment out one thing in the Makefile for that. I have successfully built, without a hitch, the entire thing from start to finish without a hitch, using all four compilers, or SC/MrC alone. This is a Good Thing.
So I think I am going to, regardless of whether it is all working (shared libs for MrC build, but don't work, and some of the install does not work, I think because File::Find is busted, etc.), do a source release so I can bring in more anxious and inclined souls.