I toyed with the idea of doing a
40k mod for either Close Combat V
I would base it on the awesome Stalingrad mod and about Imperium (mostly Guards with a small Marine/sister force) against Orcs (perhaps).
Or a Civ IV Grand Strategy mod
Mostly around a vast and hard to handle Imperium with energetic (small) enemies all around.
To play both projects would require the player to buy the game first (~10$). Worth the effort?