Imho space hulk isn't very fun. It's not all that it seems like. Me and some of my gaming friends made our own
rpg system of space hulk, and it is way better because then you get the actual feeling of being inside the space hulk, instead of just wargaming. If you want to play space hulk though, you can just play a game of
40k with 5 terminators on a space hulk map, and have the other player randomly generate genestealers.