Update...
ParaGrafix PE was attached to the walls and ceiling. PPP was then applied between the observation booth PE window frames and later retouched with the 50/50 grey mix to block light leaks. PPP was also used to bring the frame edges up to the level of the slanted lower surfaces of the booths. Basically I wanted the frames to look integrated with the booths.
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The back wall and floor:
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The floor was sprayed with Tamiya Ocean Gray 2 which is very close to the color of the 50/50 mix.
The walls and ceiling were sprayed with Testors Glosscote in preparation for decaling:
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I also sprayed the shuttle with Tamiya Light Ghost Grey.
Prior to that I extended the rear landing strut so it is more in line with the bottom of the rear of the nacelles.
Oh... and there are lots of decals for the shuttle too:
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For the nacelles I'll paint them a slightly darker tone using Testors Light Ghost Grey and a touch of black (or maybe steel).
Or if one of my other grey paints is a little darker I'll just use that.
I must have a half dozen shades of grey in my stash right now.