I have an old 1u Dell PowerEdge R410 server collecting dust in a closet. It has 4x 3.5" HDD SAS/SATA bays up front that I want to try to put to use. I only have 2x 8TB IronWolf drives, a couple 4TB drives and a ton of really old 1TB drives. Unfortunately, it doesn't have any internal M.2 or OS drive bays so I will have to sacrifice one of the front hot swap bays for an OS drive, but the first iteration won't be a production deployment so I can play around.
I have a ton of old hardware, several OptiPlex PC's that my job was throwing out (nearly identical spec to what Linus used in the LTT video) as well as a load of old machines I can use to cobble something together.