I bought a server case almost 20 years ago that I still build in. There's tons of bays 10 - 3.5" Plus 2 more for a floppy, 6 5.25" bays and some decent cable management. the difficulty comes from getting cables long enough to go from those two 5.25" bays at the top of the case.
When I bought it I cut part of the side out a put a window in because at the time cold cathode tubes and el wire was popular, now it's just there.
It's huge so i've often considered a newer case. My last two computers have been store bought so it's sat in my closet until just recently. It just barely fits under my computer table, and as I age I become more aware of a room's aesthetics so it may be time to trade in for a smaller model.