I have a somewhat similar project based around the raspberry pi. It's rather DIY compared to Helios64's project - 3d printed case, hand soldered electronics, amazon sourcing - though the goals are similar. Specifically, my goals were to host 2x 3.5" drives and to be printable on a standard 200x200 mm 3d printer.

https://old.reddit.com/r/DataHoarder/comments/n277ip/raspber...