I also found this interesting:
"Based on Giger’s designs for Alien, the Xenomorph costume was originally intended to be transparent. However, effects artists in 1978 were dealing with extremely limited resources, especially compared with what’s available today, and a proper see-through silicone rubber material that wouldn’t tear with movement simply didn’t exist back then. Giger and director Scott settled for a darker, stiffer mask latex instead, and had suit performer Bolaji Badejo stick to the shadows to better hide his rigidity. In Aliens, Cameron battled this problem by opting out of a full Xenomorph suit, and instead having his performers wear leotards with pieces of the suit attached to them, allowing for more mobility. In Romulus, not only did Mahan know how to capitalize upon Giger’s original idea, but also knew ahead of time, based on working with Cameron on the sequel, how to build the suit better and faster."
More production shots and behind the scenes info can be found here:
LA Weekly: Building Nightmares: Shane Mahan Gives a Behind-the-Scenes Dive Into the Special Effects of ‘Alien: Romulus’
That said, I also came across a figure of the concept model of Big Chap over at BBTS. Imagine this in 1/6 scale
Alien One:12 Xenomorph Concept Edition Exclusive Figure
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