yes the solo rules are in the deathwing expansion. I own space hulk and deathwing, plus most of the white dwarves. I also have a copy of the \"second\" computer game, ebay usually has a few copies of this for sale. if your computer would play it, I recommend picking it up too, very cool. Space Hulk was only a gamesworshop game, not MB. I am not an expert but the only games I know for sure that GW did with MB were: Heroquest, Battle Masters, and Space crusade. All of which were great games that I own.
although space hulk was released at two different times by GW. I have the original version. Another note of interest, the genestealers were not part of the tyranid forces in the original version but a seperate race.