The noisiest thing in there is the old hard drive. Besides that there are only 3 fans inside the case. The AMD's 3600+ is quiet even on full load, GFX card cooler is quieter than the CPU cooler and the PSU cooler, the main extractor of hot air from the case, is low rpm too.
I'm still alive, my apartment wasn't singed by the raging flaming inferno. Temperatures are still a decent 35 celsius average. Case withstood a lot of moving around, this time the cardboard is really stirdy (this being a v3 of the cardboard mod i did). I'm quite pleased with the mini PC
No reinforcements whatsoever. Just hard compressed cardboard, quite stirdy I might add.
Only metal pieces in there are the screws and little tin pieces on the other side to catch the screws.
The components inside are stacked in the manner of giving constructional support, ie: power supply is pushed into one corner and is doing a wounderful job at it, graphic card is secured with a narrow slot so it's holding the lid without bending.