Originally Posted by tomcatter
were they entirely white, though?
No they weren't, if that's HM's final intent it's pretty lazy. Most payloads had all sorts of fine detail and I suspect HM isn't really prepared for that.
STS-9, Long Module 1 first flight. Note the yellow hand rails, sponsor "patches" and truss beams, all missing from the pre-pros:
STS-73, LM1 again, similar missing details.