I have been busy lately (getting back to work and such) and I didn't take too many pics, but I have a few to show ya where I am now!
I got the 1/4" outer skin plywood cut and painted with Behr exterior primer and paint combo with some silver shade tinted into it. I even used some to go around the side windows and therefore the black trim (I thought it was a bit visually distracting so I got rid of it)

With my dad's help I ran the new trailer lights wiring down inside the trailer's tubular (square shaped) steel from the front by the tongue all the way to the back on the driver's side. Here it is in the front.

The back wall of the cap meets up with some 1/2" plywood that is multiply screwed into the most rear studs of the side-walls. My intent was to hold the rear of the walls in from leaning out. Even with the cap bolted down onto the walls, it still leans out a bit (Grrrr

)

Here is a look inside from the open door in the cap's rear wall:

Here you can see the black circle which is just the residue of a large plastic tub I had the plywood on when painting both sides (and ply edges)...you can also see both the short bolts and the long 3' threaded rod that holds the cap down:

I used short pieces of 2x3 to go perpendicularly under the floor to catch two of the floor joists (painted black) to make sure the cap is REALLY held down:

The new wiring as it pops out the back:

Driver's rear light temporarily mounted with the bracket that will hold the license plate...I'm going to have to run a wire from the mounting bolt for the light since it is supposed to be the ground and directly touching the trailer metal.

I'll need to paint the plywood that the light mounts to:

===I still need to finish the lights and then it is essentially campable...but I still need to make covers for the windows for when it rains as well as making a "stop" from a strip of 1x2 on the inside of the whole back wall and some weatherstripping as the walls lean out and leave a gap.
Also, at SOME point I WILL install a "fantastic fan" in the roof and run some wiring for other 12 volt stuff
I also have a 6x8' roll of linoleum remnant to lay down (or glue down) as the floor...OR I may go with indoor outdoor carpet.
My friend also mentioned that a heavy-duty garbage can manufacturer now makes totes that are STRONG...so maybe I'll make a modular bed platform out of them and have storage with options !?!?
...........progress is going to be relatively slow from here on in...but I want the bulk of making it leakproof and fully campable before it gets too cold!!
THOUGHTS? OPINIONS?
_John