I see the question pop up occasionally on what is a good way to install a PC monitor or TV into a cabinet, but to do it without doing the "shelf" thing. I decased a PC monitor for a project I'm currently working on and I documented how I am doing it, so perhaps this will give others some ideas on how to do something similar.
When you take the case off a PC monitor or TV, there normally isn't anything that physically attaches the chassis to the tube like the frames used on arcade monitors. The case of the PC/TV monitor normally have plastic tabs built into it that keeps everything together. This means you will have to come up with a way to attach the tube and chassis to the cabinet.
What I feel is the best way to do this is to attach everything to a bezel board, or in other words, attach the tube and chassis to a wood board with the appropriately sized cutout for the screen. In order to make it easier to remove the entire monitor in the future if you ever have to, you will want to mount the bezel board to your cab in a way that the whole board can be removed with all the components attached.
I made brackets for the tube by taking a typical angle bracket and adding an additional bend in it with my vise. This additional bend allows you to run a bolt right through the tube mounting ears, which is the only good way to attach directly to a tube.
Also shown in the below pic is a piece of slotted flat bar that I bent in such a way to attach the chassis to the bezel board. Note that I cut the slotted flat bar through a hole so a notch was left at the end. This is because the PC chassis had nylon standoffs attached to it, and the standoff will fit into this notch. I also added a couple nylon brackets in the bottom corners that will keep the chassis from resting against the metal slotted flat bar, and it also keeps the chassis from shift side-to-side.

Here is a close up of the tube mounting bracket. It is always a good idea to use bolts to secure the tube. I wouldn't trust wood screws to hold up a heavy tube.

Here is the chassis installed in my make-shift frame. Before I install the monitor in the cabinet, I will add nylon zip ties around the chassis standoffs to the slotted bar to keep the chassis securely in place. Most PC/TV monitors will have front panel buttons or controls, as well as a power switch. You will most likely need access to these to adjust your monitor screen size/color/position/etc. On the PC monitor I am using, the front panel controls were on little boards that I removed from the front of the original case, and the wires were long enough from me to bring them around to the under side of the chassis. Again, nylon zip ties will be used to secure these to the white nylon braces in the corners.

This shows the tube mounting ear secured to the mounting bracket. Bolts with a nut & lock washer should be used here.

Braces are secured to the sides of the cabinet, and the bezel board will be screwed into the brace.

This shows how the control panel will lay against the bezel board. I used an aluminum angle from Home Depot and cut it to length. I left a gap between the bezel board and the angle for the artwork bezel and plexi.

View from the front.
