The enclosure found on ebay arrived today. My guestimates (since internal size wasn’t mentioned) look to have panned out, and it’ll contain all the parts quite nicely.
Fortunately I had a piece of aluminium plate left over from my grandfathers materials which will provide the needed backplate for the plastic box. It feels nice using something that was his in any of my projects.
The driver board will just about fit in, though I’ll need to be creative with mounting the power supply. I’ll be cutting some holes in the top access panel for the driver’s D-connectors, the IEC connector will probably go on the top or side where gravity shouldn’t let it fall out. Bottom is probably going to have the illuminated mains switch and the five 4-pin XLR connectors for the steppers and motor drive. The left-hand panel will have the filter-protected exhaust vent.
A fine wire filter grill will be going on the front panel to direct air onto the PSU, which will flow across the box and out the exhaust. The box should be kept at positive pressure. The box is far more environmentally sealed than I really need. All I really want to ensure is no dirt and spiders get in it.
Also found a few little 12v fans that should replace the defective one on the driver board. Got a 24v 80mm fan for the front that came off an old LaserJet printer. Not sure where to put the emergency stop yet. Got to be the soft-off interlock on the driver board I think, since cutting power might still leave steppers moving for a short time. Also might not want it on the enclosure itself, but remote.
Mounting the readout is also a puzzler, but can be done later.