@Jethro:
a) I think there are, but I use Mediator.
b) Yes, on classic hardware. (NallePuh with AHI may work too)
d) I haven't used OS 3.x for a long time...
e) Daily, yes. It's slow. VBCC, on the other hand is fast. I think the size of the C code is ok, especially when not using -lauto and after stripping some info. Also optimization flags help.
g) I would say 64 MB is minimum. It should be enough for JIT too. The more the better. GCC needs memory, disk buffers, JIT etc...
Yeah, toying

But don't forget all those nasty bugs :-D