I finally got the wood dry, and I "painted" the inside of the void with epoxy, which will make a permanent and waterproof bond with the wood.
Shown here is after I epoxied the innards. As well, I siliconed (black silicone) the wire trough so water would not find its way into other areas. I did a test of the wiring trough, and there was no opening in the bottom for a drain, so sealing it at the top was the appropriate action.
I did discover some delamination of the plywood on the passenger side, so I got this taken care of just in time. In the photo above, I was able to insert a screwdriver and wiggle the plywood - definitely delamination.
When I applied the epoxy, I made sure an ample amount oozed into that crack.
After the epoxy and silicone are cured (overnight), I will begin buttoning up the lights. I did buy new gaskets so hopefully I will make the coach water-tight. And if not water-tight, at least any water intrusion will not do any further damage to the wall.
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