the chassis is made of 1mm aluminum, the edges are nicely rounded, riveted together. pieces are screwed together.

the cover is a single piece, those screws are going to be replaced with thumbscrews.

the hard drive caddy is removable, with a single low-speed 80mm fan. the caddy is designed to hold 2 hard drives, but it has just enough room for 3 hard drives, with about 2mm space left between the drives.

the optical drive bay is riveted to the chassis. it is screwed to the rigid panel that joins the front and back plates of the chassis.

the power supply is supported by an L-shape bracket, mounted to that rigid panel.

the PCI slots are cooled by one low-speed 80mm fan, with an option to mount another fan. btw, all these fans will be replaced with low-speed panaflo fans - you can't beat fluid bearings!