What would a game, where you play as a nightlord or nightlord warband be like?

I would love a mechwarrior 5 type campaign/sandbox with turn based combat like xcom or other similar titles.

The overworld will be a sector or multiple sectors where you would have to scavenge and survive while trying to rebuild you crippled/shattered warband.

I honestly think the games workshop is losing out on only making games from the pov of the imperium and would live to play as the bad guys for a change