Indeed, that is why Giger was so mad that the guys over at ADI were always so adamant that the A3 design was solely theirs.
If you check out the footage in the museum there's a couple of interesting pieces all over the place, like an incomplete Cinemaquette alien and a McF Li II sculpt. Very nice details.
Also, around minute 29-30 there's a very good look at the "statue" in the museum. What was very interesting to me is that it looks more like a mix of statue and suit. The head seems to be mechanized head, you can clearly see the wires that worked the translucent lips, but the wrists don't have the tell-tale signs of the partition between arm and hands. And the whole size and proportions look like a stunt suit and not the Bolaji Badejo suit or statue. Very interesting... maybe it was put together from different pieces.
There's also an interesting shot of the alien hanging from the ceiling, and it looks like an unfinished statue. You can see the lack of detail on one leg and the arms.
Lots of very cool info if you look closely.