I installed the black plug on the voltage regulator that Chris had previously wired. Since neither the voltage regulator or the plug were marked, after some online searching, I figured out which side of the plug was the power and which was the ground. Chris then wired up the ground to the engine side tree.
Chris continued working on the ground tree today. He was able to eliminate a few grounds from the remaining group and completed two rows of grounds. Only a 100 or so to go
While at it, he wired up the speakers with a couple of waterproof plugs. I'm thinking about how to restrain the wires and plugs.
There is a plate that is riveted to the top of the speaker bracket. Both the windshield and the skylight screw into this plate. The speaker bezels are a tad too big and stick up where the top plate goes. So, I'll have to cut/sand off this bit to fit flush with the plate when installed.
The prop bolts came in today. Unfortunately the spacer to engine flange bolts were not threaded all the way and won't work. The good news, the spacer to prop hub bolts fit perfect.