Well i have the cabinet in side now, the monitor is mounted in the rotateable frame
The rotateable frame slides into runners in the cabinet, it has to be perfectly square to work properly and it took a lot of hassle to get it that way. Ive since thought up a better easier way to do it too

Now i have tryed the moniter in both orientations and rotateing to verticle screwed with the colours in the corners, rotateing it back after running the monitor screwed the colours in horizontal mode. Looks like ill have to invest in a degausing wand if im going to be useing it in both modes, it is a just a cheap television after all.

Screen in both horizontal and verticle mode

Desided not to paint the cabinet but rather use a vynal finish, has a checkerplate finish and will do nicely with "metal slug" graphics