Jack Kirby's statue of Space God in his craft of stone from The Eternals #1 (July 1976)

leading from:

Alien: From Fleetwood's Pace Arrow motorhome 

to Jack Kirby's Leviathan Whale 

to HR Giger's Necronom III 

to Jack Kirby's Celestial Giant in Rocket Capsule Statue 

to HR Giger's Space Jockey

and
Jack Kirby
and
'Pakal Votan' tomb lid
and
HR Giger's Necronom III

a) Kirby's Space Capsule configuration as an evolution of an earlier one he did?
Kirby drew a capsule for £3 of his 1975 comic Omac, but he used that general configuration for his space vehicle in The Eternals. 

chapter 3 of Omac, #3, April 1975

Space Capsule from Kill Omac and the space vehicle statue illustration from The Eternals

 Celestial Giant in Rocket Capsule Statue from The Eternals

b) Space vehicle statue references Pakal Votan Tomb lid 
This would have been a general starting point, inspired by Von Daniken's work, the relief on a Mayan Tomb Lid, thought by Eric Von Daniken to represent a extra-terrestrial king who flew a rocket

c) Referencing his 1957 comic book story  "The Great Stone Face"
However this presence of a huge giant statue in a spacecraft also goes back to his 1957 story of an ancient giant astronaut sitting at the controls of control room, in suspended animation with his heart beating once every thousand years. Which is quite incredible in the way the idea came back long before Von Daniken started writing his books of ideas about ancient astronauts
 

See:  "The Great Stone Face"

 

 

d) See:  References Giger's Necronom III?