msmith,
I removed the CRT sets from my Bounder and while it is not of the quality of a National, it was a bear to remove. I looked at a lot of articulating arm mounts and couldn't find one that locked in the stowed position, so I just added one to the mounts I did buy and used a patio door lock to hold it in place.
This year I saw several locking mounts in new units and a neighbor but one in his Southwind. I found them on Google by searching for locking flat panel tvs or something similar.
I ran a HDMI cable to the rear TV and have a splitter box on top of the old splitter box, No Ducted A/C I or conduit in my rig so routed it under trim pieces and along the frame rails.
I also removed the plywood panels from the cabinet doors and had smoked glass installed so I could use the IR remotes for the splitter and for the BluRay player, without opening the cabinet doors.
So far your conversion looks pretty good, wish I had real wood in mine instead of vinyl covered luan.
I see if my pics are still on PhotoBucket.
