It's been a while since I had any updates, but I've made huge progress since then.
Ladies and Gentleman,
this is Mambo No. 5 Behold my newly mounted monitor!
What I did was reverse the internal chassis mounts so that the bolts were pointed backwards. I then drilled holes in a piece of plywood and mounted it inside. I followed that up by drilling holes in the middle of the plywood for a vesa monitor mount, which is what's holding up the monitor.
There's a lot in the process I'm leaving out...let's just say this has been a huge learning experience for me and a reminder of the dangers of complacency. (I started the project obsessively measuring everything, but I've been doing so well that I got careless with the plywood, and ordered it too thick, so I had to deal with that. Thankfully I was able to without too much hue and cry.)
In addition I've got the marquee lighting set up. These pictures are a tad out of date, as I've got wire holders in place for the usb cables now, but this still shows what I've done:
Mounting the monitor was by far the hardest part of this project. While there's still a lot to go I feel like my estimated completion date of end of August will be met, at least for something that's functional. Still need to deal with the bezel, T-molding, general cleanup and minor repairs, and mounting the control panel when it comes (that was something I did purchase premade).