While sequel Dawn Of War II has a modding scene of its own check out the Elite mod for its Retribution expansionthe original is more popular with modders. Just have a look at its Mod DB page for proof. It pushed RTS into the territory of tabletop wargames, with a focus on throwing units into killzones, only with the computer rolling the fistfuls of dice. The small collection of miniatures you can afford and the slapdash paintjobs you can give them will never live up to that. The rulebooks and fiction of Warhammer 40, describe an opulent universe splitting at the rotten seams with every idea its designers ever had or stole.