When you look at the wall's structure from original Alien and Prometheus.
You notice that Prometheus's wall's look very metalic and the Alien wall very
organic....
My theory:
The Alien species do mimic the SJ world... to trick victims..
So first there where SJ's .. then they discovered the alien species...
And the SJ's found out, that this species produced this stuff to build there
hives...This stuff did have one big advantage no corrosion...
The SJ's cloned thousend's of this species.. for their own use.. to let them build
Derelict like ships.and other stuff( The same we use catarpillars to get silk )..
This went ok for thousend's of years...
But what the SJ's didn't know... that some of this species escaped
and started building a copy under ground of the SJ world..
So they mimiced the sj world.,. to trick victims
Such a species even exists on our planet...
In some new zealand caves some kind of slimy organism produces bio light.
They live with millions on the ceiling of the cave, and mimic with their
light the night sky...it looks like stars... and night insects what fly into
the cave.. are flying to these lights..and been trapped in the slimy stuff..
Well just a theory.... don't shoot me..lol