So, I took the rear shots of the d200 and the d300 from DPreview and scaled/aligned them to as close as I could make it fit, using the flash hot shoe as the reference point for size and alignment. The eyelets on the right hand side were measured and have the same internal dimension, so I am pretty comfortable that these images are equivalent in dimensionality.
Then I layered the d200 on the d300, and the result is attached.
The menu buttons have moved quite a lot, it seems that the space for the new large LCD came from the left side button area. The d300 is a lot squarer than the d200. People with very close fitting housings for their d200 (like my Sea and Sea) I think are probably going to have problems fitting the d300 to the d200 housing.
