I was thinking more like mounting this from below kind of thing...
Full range of motion and adjustability so you could replace the panel with something similarly size and not have any real additional work. Would just need to tighten it well to not fall into the box over time. Nothing wooden would need to be adjustable.
I have a couple of those here at home (one of them's from PA, it may in fact be that exact one... ).... I have my doubts you'd be able to tighten it hard enough that it's going to hold up the weight of the TV/Monitor in that fashion. You'd be better off getting one of the flat/fixed ones and raising it off of the box bottom with a couple of 2X4"s.
There's also the issue I ran into when I had my original gas shock mount setup attached to the same desk/table as the controller was on.... the single point of contact (in this case the one bolt holding the vesa plate) is highly susceptible to movement and there's no way around that without removing external forces (in my case, moving the mount to a different table/desk) or shoring the monitor up with more secure contact points.
It's like putting a weight on the end of a fishing pole and trying to keep it from moving around....
no actual lever buttons on the side?
My buttons are on the controller. This was always intended as a stand, not as a full cabinet.