The Windows shell you mention was called Cygwin, and it was mainly for the very early days of Core3, but eventually was dropped support in favor of pure Linux flavor-based builds in Engine3.

But duff is right, a lot of things have changed since those days, and not just code-base alone, but the attitude of staff as well. Scurby is certainly willing to hear any and all reasonable suggestions, but one must remember as Duff also said, Oru owns the rights to the engine that runs Core3, and he uses it for commercial purposes (that I too would like to know what, just out of curiosity).