Made the slide out for the basement TV this evening. I would have loved to use a heavy plastic or aluminum, but have yet to find a rea$onable source, so I'm thinking I'll just spray all the wood with bedliner spray. I already plan to make a couple of revisions, one being to use a bigger piece of wood to make the 2 pieces that form the backwards "L" be 1 piece. That'll shave off a little overall thickness of the setup. The other revision is that I originally used a small piece of wood for the mount. I noticed the slides wanting to twist, so I added another piece of wood. I will revise it to make that 1 longer piece of wood.
I used this mount Wall Mount World | RV and Marine | Articulating Tilting
, which I lucked up and scored from a member on another forum for $50 shipped. The way I have it designed, I'll have to remove the TV from the mount base plate for travel, and remount the TV to the mount base when setting up. I will be able to slide the setup in and articulate the TV into the baggage door opening at the end of the evening, so at least I don't have to tear it down constantly. Also, I used some slides that came off of a trash can cabinet that was getting demo'd on the job I'm on. I would say try to get the heaviest duty ones you can find and nothing under 22" full extension.
I typed this once with more detail, and my laptop shutdown before I could post it. I'll update again after more progress....hopefully I can make the revisions tomorrow and get it set in the camper. Anyone planning to do this, I'd say the most attention needs to be paid to figuring out the proper height that the mount and slides need to be installed at. For me, the trick was getting it set at a height where it could stow just inside the baggage door without having to unmount it. That takes a bit of measuring to figure out how everything offsets.