How about this as a controller cabinet ? It's a Network server cabinet I acquired.
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The computer will take up 4 units of the racking and the control electronics will be on an ali plate 750 x 500. That leaves a great space 450W x 500D x 750H, ideal for building in a tool cabinet. This photo is of the back. At the moment there is a steel and smoked acrylic door at the front, which will clip in either front or back.

If I were building a small machine, this cabinet could house it all.

Rob