Good news, no major problems with the panel. It now looks like this: 

This led me to start thinking in more detail about how to actually connect everything. My original plan (at least for the prototype) was to use stripboard, and I spent a lot of time today looking in to stripboard prototyping. Unfortunately, when I got home to start doing that I realized that several of my components simply won't work with veroboard because of pitch problems (in particular, the game controller joysticks used for camera controls, and the resource lights. It's possible that, If I'm going to have to use PCBs, I should just use them for everything. I have an old kicad file describing some of the circuits, and I can fab things at a makerspace nearby. 

More fruitfully, I spent some time thinking about wiring. I was going to just solder wires to headers, but the article above said I shouldn't do that. A little googling and I realized I can get JST connectors to use with ribbon cable, which will be much neater.