Dude, that is totally cool - when I saw the scientists I was thinking it reminded me of Alien, so when I saw the runners =
Don't know if you already have game stats for this, but if you don't I did up some d20 skirmish stats based on DDMs for AVP here
The Marines are fairly cheap, ranged and light weight.
The Aliens are fast and dangerous in melee, even when they die and splash their enemies.
The Predators are expensive, powerful with multiple activations, but "slow" because they move limited each time.
Freelance and the Corporation are tricky with a mix.
There are two sets of stats, 2nd set here
It introduces Lawless, a very chaotic group of humans.
