Ivylog,
Good idea to use the mounting holes for the feet to help support it. I didn't think of that when I did my install. I might check out my install to see if I can use that for a bit of extra mounting rigidity.
On my gasser, I had a similar wooden surround and cabinets around our CRT TV. Since I whacked my head once or twice on that TV cabinet, and wifey did several times, I removed the entire TV cabinet when upgrading to our LCD TV several years back. This allowed a slightly larger TV to be installed AND removed the head-bonking threat. It also allowed me to install it flush with the ceiling on top to give extra inches of clearance below. I supported it from the ceiling while I added some extra supporting wood braces up there. I have two zip-ties zipped to rings in the ceiling to catch the TV should the main ceiling mount fail. I doubt it will. These new TVs are so light. My install did require some additional woodworking, moulding and stain matching, but overall it came out pretty good. And best of all, NO MORE HEAD BONKS!!!! LOL
Now I'm working on installing a larger TV in motorhome bedroom. I bought a heavy duty swing-out support. But now I'm rethinking that. The dang support arm weighs about twice what the new LCD TV weighs!!! LOL Still much lighter than the original CRT, but I want to screw this one to the wall so it can be moved out of the way. I'm torn between switching to a lighter duty, lighter weight swing-out support or the much heavier one I bought. Decisions, decisions!
As I think of it, though, I might be able to use your idea to use the foot support screws to support the TV when it's stowed against the wall and bouncing down the highway. Food for thought.
Thanks for sharing your work & ideas.
~Rick