Thanks Zeb. I will look into this for the next build. I'm always on the lookout for something new to learn.
Anyway... monitors are here! They work and fit perfectly in a vertical orientation. The smaller footprint allows me to get a somewhat taller CP than I was thinking would fit too. Installing them was not too bad once I worked everything out.
First thing I did was de-case the monitors to get rid of the ugly bezel. This allows for the screen and matte board bezel I'll make eventually to be mounted right up against the glass - the plastic bezel is at least 1/8" thick and would leave a gap plus it's not flush because of the "Dell" logo and control panel buttons. De-casing a monitor like this is super easy and takes about 2 minutes.
In order to position the monitor exactly where I wanted, I made a panel the width of the cabinet interior and about 5" high (the height I picked was random - just has to be big enough to use the VESA mounting screws on the rear of the monitor). And because I am the way that I am, after I cut the pieces I spray painted them black just so it would all match on the inside… where no one will see anything.
Using a template I found online, I centered the VESA mount holes in the panel and drilled them out using a large bit. I needed these holes to be oversized on purpose so I could fine tune the final placement of the monitor making sure it was centered. I used a 1/2" forstner bit and tried to drill as straight as I could. Then, to fix my F up I added a 3/4" spacer and drilled out 4 more holes so the M4-.7 (45mm) screws could pass through the spacer as well. This gives about a 1/8" wiggle room in all directions so I can position the monitor dead center and then tighten down the screws with some oversized washers providing the pressure.
After this was all assembled, I just popped this into the cabinets resting each end of the stretcher on the bottom rail. Then I centered the monitors and tightened everything down. With the monitor in place I was able to get an accurate measurement of the CP height, which turned out to be exactly 5". Plenty of room.
Anyway, they are installed! Came out great. I also quickly tested the monitors out using my Raspberry Pi 4 setup and it looks great. Screen is really large relative to the cabinet, which I like. One thing that I haven't seen before is these monitors have USB ports on them. Is this strictly for providing power to something? If so, they are in a perfect spot to power the marquee LED.
Coming down the home stretch. I'm going to order the monitor glass now that I can get an accurate measurement so all that will be left is the back door, marquee and CPO to sort out... and the coin box, interior service panel, marquee LED, speakers and some other miscellaneous stuff.