Fun with 1/4" graph paper.
I played with layout a bit last night while waiting for my carpool. I settled on a single housing with 3 compartments by function......each with it's own fan(s) and ducting.
Case consists of a monolithic assembly 18"x18"x8" which occupies a similar amount of space as the existing tower once the handles and slight side curvature are factored.
Similar aesthetic to this case: [url:
http://www.theapplecollection.com/design/macdesign/Gx.html]
But without all the extra curves, keep the dome front and slight flare of the side panels. Overall look more like: [url:
http://www.theapplecollection.com/design/macdesign/G5-2.html]
The dome in front, occupying the top 1/2 of thr front panel is the mobo proper: a Cube size mobo w/ 8 RAM slots and as many as 8 Gn processors. the dome unlatches and swings open.
Below the dome are two tray-load optical drives-which are the front 2 drive bays in the drive section........ which runs along the bottom 5" of the case. The drive compartment holds 2 full-height optical drives and as many as 6 HD's. Frames and thumb-screws included for up to 6 drives.
The entire remainder of case volume is occupied by 6 PCI slots arranged vertically. Only the optical drives run from the mobo. All HD's run from a factory installed 3rd party drive-host PCI card.
Case has up to 4 fans. Access to rear and bottom portion is through a hatch like the one we all know and love but since the mobo is up front the PCI bus can be along the inside of the non-door side of the case. Modularity could allow for swapping PCI bus architecture, mobo and drives seperately.
Power supply is moved out like the cube's brick (flame bait

) to remove it's heat and wasted space. Airport and other "peripheral" I/O cards (like the modem) move to a series of PCMCIA slots along the PCI-chamber side of the mobo.
I call it the Gx Gorgon. With an upgraded ADC and Firewire moved to the monitor you'd have that top-access issue taken care of. All standard connectors save those for networking move to the Gorgon's "forehead", Networking connectors move to the rear of the PCI compartment's exterior.