In the first freenas build video I watched (some years ago), the system builder actually fabricated his own mini itx case from sheet metal and polycarbonate. It was a very interesting build video showing his machine shop and the whole design process. The end result - a case that looked like an old floppy disk organizer with no fans, drives standing vertically above the motherboard, and of course in a raid0 configuration. At the time -being somewhat more ignorant than now- I thought "ZOMG! 6TB!"
Unfortunately, the video has been lost somewhere in the tubes.