As sadly real life at the moment stops me doing hobby stuff thought i would post a few of the things we used to do with Space hulk to give people some ideas

1.) Marine vs Marine Death match
. An old classic. Set up the board in a mutually agreed way. Every one takes one five man squad (old system did have a points system to do this but we used to ignore this) winner is the last man standing, or do a capture the flag or well you get the picture.

Fluff wise. Either Marine vs marine training mission. Nasty Enslavers taking over, brain bugs, Tricked by the inquisition, Blood feud, Crack out the chaos terminators etc

Rules wise, don't change how weapons work have everything still kill on the same dice rolls ( justification is that terminators are easier to hit than a stealer which balances out the armour, plus it stops people getting hung up on stuff) New heavy flamer may need tweaking now though as it used to be far less deadly to marines.

We used to use blind grenades in Marine vs Marine games but the new shield generator rules will work just as well.

Every one gets command points.

Never used to use Psykers as they were far too strong new edition may vary.

2.) Changing miniatures. Lots of people talking about changing rules for new enemies which is all fine but a nice change of pace can be had simply by exchanging the stealers with other suitable miniatures. Blood letters are a classic for this As are ripper swarms particularly the forge world ones.

3.) Company level battles Build an entire space station hulk etc and play a massive battle with multiple players per side. Quiet a few of the old campaigns could be played in this way. Anyone with access to google can find them in about 10 seconds. Often found a GM was useful for these types of games. Give different chapters marines different objectives which may not quiet tie in with everyone else's and your away. Also give the GM a small third side to control to allow them to keep the game moving in the past mysterious Predator type aliens have been seen as have imperial assassins.

4. Zombie fest Another classic have the rules sheet on paper some where but basically slower nad less good in CC than stealers Unable to open doors. Triple the number of Zombies for each blip. They also got back up.... Great for a resident evil type game

Hey ho that should hopefully get people thinking