The company I used to work bought custom made boxes from a fab shop. This fab shop - all they did was make metal troughs and boxes. Indoor or outdoor. They even provided POCO approved CT Cabinets for less $$ then the POCO.
I was told "if you draw it out and / or explain it to us - we can make it for you"
I put them to the test too. I had some interesting troughs made!
Good stuff Ken,
When I was doing dairy stuff we always fabricated our own Stainless steel "enclosures", all you need is a sheet bender, a clue as to what you are doing and a TIG welder to close up the sheet joints and make the thing water-proof and look nice, of course.
Most fabrication places are only too happy to build a one-off provided they get good plans of what you want and a time frame of when you need it.
My only reservation would be, would an independent enclosure be " UL listed" at all?
Would it need to be?