Finally built myself a nice 3D printer enclosure from IKEA cabinets.
Basic idea is to take a shallow (20cm) and a deep (40cm) cabinet frames and to stagger the bottom/top panels and wall panels, making a nice single-piece 60cm cube. A bit more info with a short how-to and a few ideas and nuances.
I've thought of building a Voron, a RatRig or another printer that can for inside its own rectangular frame into a cabinet too.
90's "media centers" that were rigid enough and deep enough to fit large CRT TVs might be a good fit for a printer enclosure too (if you can transport them to your residence that is).