THEORY
This ship
became (part of) this building.
These Engineers
are the ones depicted here.
Possible motive?
The ship and crew were early generation Engineers and the very first who went on a mission to seed a planet.
After their return the then outdated ship got turned into a temple/monument as a way of honouring the mission. With the giant heads added to honour the crew.
Offcouse it's possible the temple was made to resemble the ship but I could see them re-using their old ship and turning it into a temple/monument.
Because I consider the Engineers some what eco friendly and can see them recycling
Aside from the ship/temple theory, there's this theory about an ancient civilization that send out 7 enlighted ones to create new societies. And there's 7 Engineers in the group picture, not counting the sacrificial one. So it could've been some kind of inspiration.
Got it from The Missing Gods (2020) documentary. It's mostly theoreticat but still interesting.