I know what happened to the space jockey, and the eggs on 426

For part of your comment- in a broad nutshell, the egg chamber was on the planet per Giger's concepts. Time and budget at the time didn't allow its development so it basically got written in as part of the ship. Believe me- there are others who can break it down way better. I just gave the fast down and dirty.

Sorry man but your wrong. The only thing that is official is what is said in the movie, which is what kane said, its like a cave. This actually give validity to what you said, but as far as the script is concern the only thing which is cannon is the fact that its a cave. You cant go by a script that has the space jockey as some kind of creatures skeleton that has since changed into Jesus. 

Maybe we are talking about different things/aspects. I am speaking of the real world production- not in movie. Giger's cave concept was cut due to time and funds when they were making the movie.

Neuroguy

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjz0J_szebTAhVC4GMKHQpDApEQFggiMAA&url=http%3A%2F%2Favp.wikia.com%2Fwiki%2FEgg_Silo&usg=AFQjCNHwu0slEC9ioGfJXv_WR7N2qhdTNA

This info is everywhere- I picked the first thing that popped up.

I am not arguing your idea- I am only supporting my claim that you seem to disagree with.

Neuroguy

That seems like a sensible theory for where things appear to be going.

Particularly the bit about the jockey having been infected, birthing a queen, crashing the ship, then this queen finding some cave under a ruptured area in the ship and laying her eggs. This would tie what has been shown in the films together rather neatly.

If this is the case, I am hoping for some sort of struggle between David and this engineer leading up to the crashed derelict. And no, not some narrative where David has become good and is protecting humanity. I'd be more interested in a narrative where David is fighting for dominance over the engineer or the engineer is attempting to steal David's technology leading David to attack with the pathogen.

Either way, black goo exposure to the engineer is likely what brought about the eggs. I think it does make more sense than a facehugger randomly escaping from a cargo of eggs that were in a massive cave on board of an engineer ship.

Problems with it being a cave and a Queen involved:

1; The blue mist, definitely technological.

2; Look at the walls and layout. NO way is that kind of ordered and complex structuring done by a queen. This kind of ordered layout also eliminates any kind of geological processes.

3; The curve of the chamber follows the curve of the derelict's main hull-body somewhat closely...as if it were a modular bomb-bay attachment to the bottom of the hull, akin to mission-payloads seen on Military aircraft today.

4; The design aesthetic matches too closely to the Space Jockey's control room for it to be a cave or a queen's hive.

5; Artificial light sources present. The chamber is not lightless, it's very dim, but not lightless.

It's tricky territory when getting into this stuff because original ideas and concepts have changed over time.  

When the space jockey was designed, it was not necessarily meant to be a suit.  

2 quotes from Giger:

"The creature we finally ended up building is biomechanical to the extent that he has physically grown into, or maybe even out of, his seat, - he's integrated totally into the function he performs."

"The pilot is conceived as one of my biomechanoids, attached to the seat so as to form a single unit"

So the original reason for it growing out of the chair, and whatever they end up with by the time these prequels lead to the events of Alien, might be very different.  

Same thing with the egg silo.  Dk mentioned the story behind the original concept and what ended up being in Alien.  As of now, it is part of the ship and the eggs were cargo.  Could that change?  Possibly.  They've retconned things before, so they can do it again.  But until then, anything other than the information we currently have is a theory.  Theories are good though, as long as we recognize them as theories.  

Lastly, "like a cave" does not necessarily mean an actual cave.

I dunno what to think anymore....

That's our problem: we think too much! :)

I'm gonna stay focussed on my literary perspective of the ALIENverse, and let the movies tend themselves...then I won't end up tripping over my brain. :D