There is an "alien" for poser available, it's similar in many respects but it's not Giger's alien. Currently I honestly can't remember who made it. It wasn't bad and I've used it in a couple of images in the past. Giger is horribly militant about his copyrights and they're fairly simple to enforce because of the unique nature of his art. But it boils down to the same thing with Battlemechs and Star Wars/Star Trek. You can get away with it for a certain amount of time but is it worth the risk? Paramount had a really serious embolism on fan sites and are still active in closing some down depending on the level of infringement of the franchise. Same with George Lucas, he's also very militant in protecting the franchise and while there's a wealthy of Star Wars resources in models and suchlike there's just as many who disappear overnight for whatever reason. The PowerLoader, Dropship, APC and various other articles from alien/aliens are available as 3D models in various places. It may be that it's just beneath notice at this time, it may be they don't care, it's impossible to say. While I would absolutely LOVE to have a good model of Giger's alien to play around with I wouldn't really expect anyone to produce one, free or for sale. Although, I think I could cheerfully kick anton somewhere painful for losing the files of his model. :)