Keep in mind that in its current state the game has no support for psionics. Without psionics, this alien would effectively be a weak, weapon-less object floating around. If you make the artwork, we'll store it for future use. But you might get more pleasure out of seeing something more immeditely applicable.
It doesn't matter if it will take more time to get to hame, or if you deside to not use anything I make, or replace it later, If I can help any way to bring Psi's to the game a bit faster, I'm happy
I would prefer to have an alien that does not wield a hand-held weapon and is not humanoid. This is mainly because we already have three humanoid aliens that hold weapons in their hands. In terms of gameplay, that means that all three change their weaponry throughout the game. I would prefer to have more unique aliens that have "built in" weaponry and can play specific tactical roles (like the Bloodspider).
Also, we don't support flying yet, but that will not prevent us from integrating the unit. It will "fly" around, just always at ground level until we get it implemented. 
As ShipIt said, we're likely to try and use anything you create because we still need more aliens. But your alien is more likely to survive in the game over the long term if it fills a good gameplay role and fits the merged bio-mechanical theme of existing aliens. There are no hard and fast rules here, but feel free to discuss any concept you'd like.
ps - were you ever able to figure out how to export the animations with the MD2 file?
Ok, I will think something. I am not very good designing new stuff, usually I prefer to have some kind of source to model/skin with. So if you can give anykind of more detailed things (shape, etc..) I'm more than happy to work with there.
Also I didn't figure out the problems I had earlier, I had some issues with my computer, and had to format it, and re-instal windows and everything, so that took some time. But I think I won't be adding these possible alien models in-game by myself, since they are for future use, and I lack the skill to do it. So I can provide models for you guys if you find any use for them. I'm going to try to solve the issues I had tought, since there is some personal modifications I would like to add to the game, and this is a game I can see play a lot in long run.
About some results, here is something I came up with as the "organig floating Psi-alien", as I stated I'm not a very good coming up stuff from my head, but it's a start. Model is about 1300 triangles, same size as human skeleton in-game. You had limitation of 1000 triangles for body, and 300 for head in you contribute section. Is this hardcoded limit, or just limitation to keep models in good size?
Textures I just throwed there to show something more presentative than colored surfaces, so it has zero details in it now. Everything you can come up with I will change, even make new totally different one.
