Already have the rack and it hosts most of my items (router, switch, raspberry pi rack, NAS, PS3 apple TV). Honestly other than the raspberry pi rack and the router, the rest are just using shelves anyways. I need to find a good, non-bulky way to take the enclosure fan and switch it on when temps get above a set point. What I’ve done in the past with an arduino is way too bulky.

I love your idea and its funny you mention the mini PCs and thin clients. As I look at prices I’m more and more leaning towards just another shelf and using mini PCs.