Nice, Plankton! Such a cool and creative build
Lately, I've been wondering about getting some outboard mic preamps and a lot of these units are made for racks. I don't have a rack and they're often weirdly expensive, so I might build one myself.
It would be sweet if I could find an old piece of furniture similar to your garage disposal with a roughly 19''' width. Might have to rummage through some thrift stores