TV mountable Board

Usual you only have a printsize which does not allow you to build a whole board.
The fact that i have a son, seven months old start crawling around make'd it necessary to move my electrical devices to somewhere else. But i didn't want to open the wall to hide the cables, so how can i move these devices on top of the Television. The problem was born and the first step of the solution looks like this board.

## Measurements
Well, just be clear, it should be pretty difficult to just find the exact TV-mount i bought, neigter i can find an "yeah, looks like the same" mount. And even when they look like the same, maybe someone can use my idea to build it for other televisions.

I have an LG 50PZ250. At the backside of the Television are the vesa mount screw holes. The horizontal distance between the upper two holes are 400mm at mine. You can, if you have enough distance to the upper backside, mount this board easily to these holes, i don't know if it may be wobbling a little bit becau