All my gear is stuff I’ve saved from the dumpster at work except my hard drives and my UPS. I’m using the IKEA end tables instead of racks (I think they are called lakka?). My jbod chassis is huge and very loud, but it was free. I dropped cables into my basement and I only hear it when I’m down there.
I started off with just a desktop tower full of spare parts, but over time it’s slowly become a pretty impressive stack.
You can get them pretty cheap if you’re patient.
Personally I use the IKEA alternative. It works really well.