I've turned a couple of old desktop computers into my homelab. They are currently "stacked" on top of each other with a Raspy, router and switch on top and a UPS on the side.

To my eye this looks "pretty enough" but it doesn't score high on the Wife Approval Rating and I would really like to turn it into a "pretty" little rack. Hence, the question: how to do it? Which parts should I get?
I'm mainly having a hard time finding some kind of "rack case" so that I can insert my desktop HW into it; should I buy a server and strip it out?

Just a few more info:

• My homelab is extremely silent (since it sits close to my desk) and I would very much like to keep it this way. I absolutely don't want server fans screaming at me all the time.
• It would be cool to have a "NAS like" enclosure for the NAS drives that currently sit inside a normal desktop case.
• I'm UK based, I know in the US might be easier to get all this stuff, but any tip or help is highly appreciated anyway.