We designed and built three credenzas with matching single rack rollarounds. Each was fitted with custom lighting (which we sweated bullets over). Dimmers were actual Variacs (to completely eliminate scr noise) which were motor driven and controlled by two neat round Birdseye buttons on the front of one of the mullions between rack sections. But that's not all - these mothers were pushed up against the 14" high step so to gain better rear access (repeat our mantra: must have rear access... must have rear access) we put the whole thing on wheels. Not just any wheels, mind you, 4" hard urethane wheels in custom welded casings, with solenoid operated brakes to keep the credenza in place when you pushed it back. Reach under the front lip in the special place, push the button, and with one hand you could roll the entire 1500 lb assembly forward 2 feet! Wow.
Putting in the lighting.
<That's Nicholas, a real electrician!
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< the up/dn button microswitches.
You can just see the birdseye up/dn button in this one that control the lighting.
Electric brakes? Sure why not...
Patch cord pull out storage, of course... and concealed tie panels in back for "transient" equipment. Later I went to 1/4" connectors for this application to save space, but back then we were ALL XLR please.