I would probably just build one from scratch. Get 4 poles and a board for bottom / top and that should be it. Or buy a second hand small rack with noise isolation.

How hard would it be to replace the legs with solid wood ones? From the guide I think you can just drill some holes in the replacement legs and it should work: https://www.ikea.com/us/en/assembly_instructions/lack-coffee...

(Of course, you can make your own tabletop as well!)

Those legs never were solid. I recall a few videos on YouTube about that, where people put a solid wood insert into them.

I tried that without strengthening but it was to fragile. Got a music rack, tiny one, and shallow, low power rack servers. It was fine but eventually I scrapped all of that due to space issues at home.

BTW Mirkotik now sells a cool homelab worthy rack.

I cut a couple open recently, and the legs are actually hollow. No honeycomb. The top ~40mm and bottom 15mm are wood composite plugs, and the center is air. The skin is about 2.5mm thick wood-ish material with vinyl-ish wrap.