More good progress tonight.  I removed nearly everything from the rear of the car, including the bumper and bumper brackets, taillight assemblies, license plate holder, trunk latch and lock, and the luggage rack.  I think the only thing remaining to be removed from the rear (other than a couple of things under the car) is the trunk lid, and I didn't want to remove that yet so I wouldn't have to find a place to store it.  Originally I was planning on cleaning up the bumpers from this car and using them for a while to save a little money.  But neither one is in very good shape, so I might go ahead and buy new ones.  But I won't need them until most everything else is done.

Here's the wiring to the right taillight.

And the wiring to the left taillight.

This shows the mounting of the ground wires on the trunk latch.