I don’t know how many of you guys have seen this model, but here we have a mock up of the original USS Enterprise in drydock undergoing her refit.
The images show the starboard engine has been replaced and new hull panels added over the top of the original saucer section. Also the deflector dish has been replaced and the bridge module has been changed.
It is an interesting concept, although I doubt Starfleet just slapped on a few new panels over the existing ship.
These are photos of a USS Enterprise NCC-1701 undergoing refit in dry dock. This diorama represents the original Enterprise after about 5 months of refit. The topside new saucer is nearly complete, the bridge, the deflector , the sensor dome on the bottom have all been replaced with new ones, and finally one new warp engine has been installed. The dry dock is completely scratch built. I used the DVD of Star Trek The Motion Picture for reference.