Alien: Early Ridleygram Egg silo references HR Giger's Castle Harkonnen?

leading from

Ridleygrams

Ridley's Egg Silo storyboard

a) In the Ridleygram, we see the astronauts approaching the three egg silos, one with a broken top that are roughly based on HR Giger's Castle Harkonnen as seen below, against a mountainous background. 

 

Giger's Dune II Castle Harkonnen

See also: Designing castle Harkonnen