Alright.... Here's a couple of pics.
The order of disassembly (and then re-assembly) is important, so if you ever have to do it, please PM me.
The only caveats are is that you MUST have three people to re-install the upholstered panel, it's just FAR to difficult with only two. You will also be bent into a pretzel getting at some of the screws to get the whole thing down and then back up. I am still sore!!
And do NOT (DO NOT!!!!!) be tempted to use anything other than 1/4 inch sponge rubber for the backing of the upholstered panel. We tried quilt batting from my DW's "stash" of sewing materials; MAJOR mistake.
When you start putting mounting screws back in with a power screw driver, the batting wraps around the screw INSTANTLY and forms a rock hard ball on the screw itself. I had one that was as big as a marshmallow. Then you have to pull it back out GREATLY enlarging the screw hole. Then I had to BURN the wad of material of the end of screws/drill bits. NASTY STUFF!!
Luckily, all the holes I enlarged are hidden behind shade mounting, etc, so are not visible. Otherwise it would have been a new piece of vinyl covering.
The original sponge rubber had absorbed a great deal of water, so I think it's been leaking for quite awhile. Not long enough to rot the plywood however.