I use a number of these lower power micro computers, mostly Dell Optiplex 3060 Micro, and wanted a rack that I could stack my nodes. I designed this from scratch to fit these PC's like a glove, to be secure and not require any tools or screws etc. when assembling, all slots together with ease. I have allowed for space at the rear to allow for cable management.
Hope this is of use.
I will likely add a design for 4+ pc's soon.