Right now my players are entering the processional of the damned and I had thought it cool to have a short old school dungeon crawl on a tyranid infested space hulk.

Im trying to find good maps to use as guidelines and get some ideas for encounters. So far no luck when it comes to maps. Using some fantasy dungeon crawl might be an idea but I don't know where to start looking for something that might be converted into the wh40k setting.

One advantage is that as it's a space hulk I can throw pretty much anything at the players. The time distortion and seemingly undead denizens of the processional of the damned also bring some nice opportunities for nastiness. As does the survivors of Wrath Umbolds expedition.

What kind of rewards might the players find?

Sorry accidentally posted in wrong forum. Could this be moved to gamemasters?

How about using scenarios from the Space Hulk board game for inspiration. You can find a few here: http://boardgamegeek.com/boardgame/54625/space-hulk-third-edition

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You can extract the maps from the Dawn of War game w40k space marines pc game. We've done that and it works great. You can either prin them out or use maptool. to extract use the world builder icw http://gimespace.com/ you can take screenshots.