[PvK]

I toyed with the idea of making a GURPS Dominions book... though it might have to be more than one book to do a good job, especially for the magic system...

I also thought of just starting a GURPS Dominions campaign without writing a book (just the usual ton of work I tend to do setting up a game world).

I also just thought of setting up some GURPS combat scenarios in a Dominions setting, even maybe simply basing them on actual battles that happen in the computer games.

I can see it being a lot of fun using the full GURPS tactical combat rules.

Edit:
As for the "market" as in commercial market, I don't know or care much. I just see it could make a good interesting game from a gaming art & fun perspective.