Here is what i used.
Paint is a combo of XF-2 white, JN Grey, and a little sky gray, all tamiya. 4 bottles white, 1.5 bottles JN gray and about 1/4 sky gray.
I mixed all in a large bottle from US plastics, then added about 45% Iso alcohol so that is was nice and thin (91% iso). 1 batch of the above was enough to do a full galactica with some to spare.
It was lighter than the studio model appears, leaves a little room for pigments and drybrushing, but still had a bit of that concrete gray tint to it.
I found that some pigments and dry brushing of the details is important in this scale, the greeblies do not benefit from studio lighting and the shadows that are created by the details on the larger model. You don't want a heavily weathered ship, just enough to make the details pop.
In other news the new head mold is done and i am back up and running kits again. Hope to be all caught up very soon, I am ready for a break from these so i really want to try to get the all shipped before Jerseyfest.
thansk
mike