While we're back on this subject (ship scale), there's a scene in STiD after the Enterprise loses power and emergency lighting kicks in. We clearly see the edge of the saucer is two levels high, because one of them (round hallway) is exposed via hull rupture. So, arguments about 4 levels on the saucer rim are out.
Also, the total number of levels in the saucer can been guesstimated from the "plaza." There are about 8-10 levels, so figure 3-4 above the saucer, and 3-4 below (but that includes the "level" immediately beneath the dome and above the bottom dome, which is basically nothing).