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.
You can also just use an IKEA Platsa cabinet, which is that depth already.
That would have been even easier, but looks like those cabinets are not sold in US or Canada. (Search turns up hardware and/or other storage cabinets)