I have standard Ikea Lack enclosure for my MK3s+ consisting of 3 Lack tables. The top one is occupied by printer, middle one is for printer accessories (filaments, IPA, scrapers… waste bin) and lower one is there just to have printer higher. I needed to cover middle one to be somehow protected from dust, so I've cut some plywood and use it as removable side panels. 

The moving part should be screwed intoto some plywood board using M4 screws. Static one should be screwed into Lack tables. Everything can be done from the inside (so only screw heads are visible from outside), because I am not planning to remove the side panels frequently.