Let me know if you ever want to delve in to space hulk retheme. I spent many many many hours on it back in 2009 & 2010, and feel it is competant, if not actually good.
Aliens Rulebook preview
Aliens Mission book preview
I don't make the downloads freely available since its existence steps on the toes of two very litigious companies I would like to avoid.
But I do send them upon request.