[SpawnOfKong]

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Um...Giger created the classic Alien. He designed it in his signature biomechanical style and put together the suit and airbrushed it and everything. So, I'm pretty sure the original Alien was what he was aiming for

Well... yes and no. While it is true that he put together the suit personally, Giger was also not wholly satisfied with the results in the first film, both because of design compromises he had to make, and the on-screen appearance. During the brief period he was involved with the designs for Alien 3, he saw it as an opportunity to improve on some of those aspects with which he wasn't satisfied the first time round -- the site Monster Legacy has more info on that.

There's also a snippet from the letter he wrote to Fox concerning the initial omission of his name in the credits of Alien Resurrection (also on the Monster Legacy site):

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The creatures in ALIEN:RESURRECTION are even closer to my original Alien designs than the ones which appear in ALIENS and ALIEN 3.

(Though it is worth noting he later said the Resurrection Aliens "looked like turds," so I suppose the above quote could be taken with a grain of salt.)

I do agree with your latter point, though, that it makes sense for the initial Alien design to have evolved over time.