While the official cases for single board computers are nice enough, I wanted something where I could apply airflow to a whole cluster worth of SBCs without thinking too hard.
I've used the boxes.py library before and decided to leverage it for this project. It provides primitives to create boxes and mating edges easily. I started with the paintcan generator and adjusted it to add holes for the SBC USB ports and the standard SBC mounting hole layout. The end result is below:
Most of the configurable parameters default to Raspi Style moutning and dimensions but there is no reason a pi-zero couldn't be accounted for by passing along the correct dimensions for the mounting holes.