Personally I did something similar here. You could likely find a rack for free if you look at to colos, data centers or schools. I got a 60u full enclosed rack from the colo I kept my servers at. The big problem was space. People look to get rid of them because they are such a burden in space.

Good stuff getting a gen9. I got a gen8 before I realized that there were firmware limitations particularly with a lack of support for gpt. I instead needed a really hacky workaround with mbr in order to run my name ssd as the boot drive at full capacity.