CC where the mobo go
Here's where the motherboard goes. The frame of the CC was cut in such a way that the 630 harness it tabbed, so it can be removed easily by pushing some of the frame plastic out of the way.
Thanks to the two-slot PCI riser, there's pretty much zero space for anything on the right side.
The floppy housing was cut to allow the video input card to fit, and now has a small screw holding it in place, as the mounting tabs were cut off.