Many flatscreen TV wall mounts can be pulled straight out from the wall a good bit, and then (at that same level) can be tilted up/down and left/right, but the height/level of the actual TV itself (say you measured from the floor up to the bottom of the TV and it's 48") - the bottom of the TV will ALWAYS be right around that same 48" height. I'm looking for a wall mount where you can pull the TV away from the wall and literally move the TV up and down a good 20" or more (so the bottom of the TV could be as low as 28" from the ground, or as high as 68" from the ground. My premise is I want to have my CRT monitors front and center, but if I want to play a more modern game on my much-larger flatscreen, I can pull the TV away from the wall and lower it in FRONT of the CRT's so it's at a nice and comfortable eye level.
I'm looking to do this with a 49" flatscreen, which is about ~30 pounds, and uses a 200x200mm VESA pattern mount (might go 43", 25 pound, 100X100mm VESA instead). Here's a quick diagram I drew up:
Something like these, but with a bit more movement. I think the problem is going to be getting enough distance from the wall (the BVM's are 22.5" deep, and I need to clear the wires coming out the back of them by at least 3" I think), and the drop needed is 20"...I don't think any of the below meet those requirements:
https://www.monoprice.com/product?c_id= ... 1&format=2
http://www.dell.com/en-us/shop/accessor ... u=A7435346
https://www.amazon.com/VIVO-Counterbala ... OUNT+VW03G
http://www.pricedepot.com/fleximounts-a ... 46lbs.html
https://www.homedepot.com/p/Stanley-32- ... /204704193
Has anybody done something like this? Which model did you use? Is it solid and stays in place once moved? These things seem to vary so much in price ($40 to $255+) I don't know what to get, and even if my proposed layout will even work. Hints, tips, suggestions are all welcome!
I'm basically doing this extravagant layout because I can

and because 20" CRT monitors are small now-adays, so I wanted 2x 20" for 2-player games, need a TATE monitor for Shmups of course, and had a bunch of extra 5 and 8" RGB PVM's I got for free so I thought it would be cool to be able to display all 7x of my systems I run at the same time for a cool presentation/conservation piece in my mancave.