No.1 and I have been P.M.ing about the interior color of the Liberator. The interior color of the fuselage aft of the bomb bays isn't consistent from the various factories that assembled the Liberator. Also, the color changed as time went on. It is a pretty complicated subject.
A book could be written about just the interior colors from the different manufacturers, timeframe, and changing specifications. The aft fuselage could be either Consolidated green, interior green, yellow chromate, or bare metal depending on who built the fuselage section and when. Same thing with the bomb bay--it can be Consolidated green, interior green, bare metal, or (possibly, there is a specification for this) neutral grey. I have much of this information written down from research that Gary Austin and I did. I haven't any idea where the material is, though, so be patient with me as I try to find it.
Here is a bomb bay photo of a Consolidated-built D taken just after the 1 August 1943 Ploesti mission. You can see the Consolidated green quite clearly on the bomb rack:
Liberator Beauties
I promise to search for my research material,
Scott