Hey guys! Just a quick update. I decided I wanted to replicate the look below from one of Dan's builds. I contacted Dan about purchasing a steel mount plate, and possibly the circuit boards, but the one in his example was just a one-off and he didn't have any of those parts available. Of course, that wasn't going to deter me at all, so I got ahold of my brother who is a machinist and he built a custom stainless steel transformer bracket for me. As for the circuit boards, I've designed PCBs in Kicad before, so those should be pretty straight-forward to have manufactured.
Dan's transformer/PCB assembly:
My custom mount bracket:
Also, I finished mounting the LCD readout in my variac. It works great! Viewing angle is a bit limited, and the readout updates in 1.5 second intervals, so it behaves a little weird as you're turning the dial since it's not giving real-time feedback. Caveats aside, it should be a useful tool for this and other projects.