I'm using the assets provided by Lex Safonov's version of Alien Trilogy (TC). He was able to extract the graphics from Alien Trilogy.
Thus far, I've converted all of the enemies to the game. They behave like the monsters in Aliens: the Ultimate Doom. Moreover, I've added more blood and gore to the death states. All the weapons have been converted as well. I have added in 2D sprite versions of the voxel-based items for now. Like Aliens: the Ultimate Doom, there will be faction-based fighting. Each level will feel like a war between the different species; with an occasional visit from the predator. I still need to add more content to the game before I can release it, but check out the video, and pics below.