Is this David's workshop?

I will try and figure out who the Chest Buster is after..

First i would add about that Laboratory and i thought the leaked Prop room was for the creature department to get some inspiration and use those Skeletons to basically work out how to design new Monsters by studding anatomy of other animals.

One Person on Set even said they had a Cat Skeleton in parts and she took it back with her and confirmed they was used in the design stage of Creatures.

But the Trailer 2 does seem to show some of these are in the movie...

So now i can answer those Small Skulls.... they are not from Monkeys or similar... they are Human Baby Skulls from a Fetus thats over 25 weeks up to a New Born and few weeks old.

Why and where would David have access to such things?

Shaw? how does he manage to get her Pregnant with Humanoids, unless there are Engineers and well they can procreate only they had no Females as they either Engineered themselves past the need, or Females was lost/taken from them in the past (Paradise has dead female Engineers) maybe this is why the Fallen Angels favored the Daughters of Man?

Because there is only a few ways David could get his hands on New Born or Pre-born Humanoid Babbie's.

"The watch and ring match Crudup's"

Logically we have to assume its Crudrup the earlier Face Hugger Scene where he is trying to remove it indeed he has Crudups Coat..

This shows the person who is Face Hugged could be Crudup in this shot as coat is similar.... have a Green inner layer or have a sweater on under the coat. Or indeed the fleece like coat as seen in the Last Supper and Briefing with Daniels

Crudup is not wearing a Watch in the Last Supper or the briefing with Daniels Clips...  Also his T-Shirt in these shots is darker than the guy who is being Chest Busted a fair bit darker.

But i would think it is SUPPOSED to be Crudrup and maybe has made a mistake by shooting a Stunt Double for this close Scene and a bit of Wardrobe Malfunction too

Thank you BigDave, the image of the skulls is dead on from the front. 

Do these skulls look natural or elongated to you? And it looks like residual flesh on them too so it may be more than an example for the creature department (included in the movie in a bowl). 

The gentleman writhing in pain is Alexander England, I believe.  He plays the spouse/partner of the woman being ambushed by the neomorph in the trailer.  He can be seen standing next to her in the 'last supper' group photos.

David could well have cloned up some human bodies using only a small tissue sample from Shaw, which would cover where the skulls came from, and possibly what was used to generate the eggs, as the clones could be used as just 'factories'.

David was there for 10 years, he doesn't sleep, so it's no stretch he could well have turned a cave or some existing building into quite a lab, and likely made much of his equipment using availabe resources and production methods available in the Engineer city on Paradise and he might well have asked Shaw to scavenge from the lifeboat in PROMETHEUS as well.

BigP and Blackwinter-witch, thank you for the comments.

I got a pretty strong confirmation on who is in the grey bloody shirt on another topic (see here) from BigDave and Svanya.