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While mATX and even ITX came far they still fall short in certain areas especially workstation/server type machines. Besides, a full length PCI card is already 12", an eATX/EEB motherboard is only 13", not much of a difference. The chassis would not be much bigger in footprint than the EEB size itself. There would be no external drive bays whatsoever.
Then comes the unique trick: I would use an SFX/SFX-L PSU in such an orientation that it makes it impossible to use full length cards in the three furthermost slots. The 100/130m edge would be lengthwise the PSU slots and would in the furthest corner from the CPU. On a normal ATX board only 14mm of an SFX PSU would hang over the board. I would raise it to the height of the PCIe slots -- because the motherboard can't have anything higher than that. The PSU is 63.5mm thick, each slot is 20mm apart, so this means the PSU will hang off the motherboard by 10-20mm but let's add 25mm for fans. If we want to put some clearance at the other edge for CPU coolers / fans then it's (305 + 25 + 25 = 355) * 330 mm. 170mm would be a good height: it gives us space for a 120mm fan in the back and enough clearance for the PSU in the opposite corner. It would also mean about 140mm CPU cooler height. So 355*330*170=20L.
A 3.5" HDD would fit across above the PCIe cards without interfering with any power connectors I think. Another might just fit beside the PSU -- the video cards are max 12" but the motherboard is 13" and the HDD is 1" thick. Now we had 345mm across, the PSU is 63.5mm of that, the 3.5" disk is 147mm, there's neatly space for a 120mm in front as well (you'd need to use 90 degrees cables). For better video card cooling this 3.5" of course could be replaced with another 120mm fan.
I have started sketching this but I am very new to CAD so if this makes no sense, please have patience, it will.
In other words: if you put this desktop case in front of you in the usual orientation with the CPU on the right, in the back then the front plate is 345*170. From left to right, you'd have the 63.5*125 PSU first touching the top then a 120mm fan / 3.5" HDD then another 120mm fan.
Lifting off the top from the case, it'd have a 3.5" bracket with the longer side of the disk parallel to the PCIe slots in the left corner, back. Alternatively, 4 2.5" disks would fit here in a two times two arrangement, two besides each other, the longer side still parallel to the PCIe slots, two on top of each other. The 3.5" is just too long with 147mm plus cabling, the 2.5" disks are only 140mm wide and the cabling is better placed for us.
On the left hand side, to help the video cards there's space for a 140mm fan. On the right hand side, depending on the CPU cooler size at least one or perhaps two 140mm fans should fit. Three 140mm, three 120mm fans, not too bad for airflow. If we can squeeze the Z10PE-D16 WS into a 20L case and cool it properly and quietly, that'd be quite a feat.
Edit: I have created an outline with the main features in Protocase designer. Dropbox - case.pda it shows where the PSU vs the motherboard vs the back fan.
Then comes the unique trick: I would use an SFX/SFX-L PSU in such an orientation that it makes it impossible to use full length cards in the three furthermost slots. The 100/130m edge would be lengthwise the PSU slots and would in the furthest corner from the CPU. On a normal ATX board only 14mm of an SFX PSU would hang over the board. I would raise it to the height of the PCIe slots -- because the motherboard can't have anything higher than that. The PSU is 63.5mm thick, each slot is 20mm apart, so this means the PSU will hang off the motherboard by 10-20mm but let's add 25mm for fans. If we want to put some clearance at the other edge for CPU coolers / fans then it's (305 + 25 + 25 = 355) * 330 mm. 170mm would be a good height: it gives us space for a 120mm fan in the back and enough clearance for the PSU in the opposite corner. It would also mean about 140mm CPU cooler height. So 355*330*170=20L.
A 3.5" HDD would fit across above the PCIe cards without interfering with any power connectors I think. Another might just fit beside the PSU -- the video cards are max 12" but the motherboard is 13" and the HDD is 1" thick. Now we had 345mm across, the PSU is 63.5mm of that, the 3.5" disk is 147mm, there's neatly space for a 120mm in front as well (you'd need to use 90 degrees cables). For better video card cooling this 3.5" of course could be replaced with another 120mm fan.
I have started sketching this but I am very new to CAD so if this makes no sense, please have patience, it will.
In other words: if you put this desktop case in front of you in the usual orientation with the CPU on the right, in the back then the front plate is 345*170. From left to right, you'd have the 63.5*125 PSU first touching the top then a 120mm fan / 3.5" HDD then another 120mm fan.
Lifting off the top from the case, it'd have a 3.5" bracket with the longer side of the disk parallel to the PCIe slots in the left corner, back. Alternatively, 4 2.5" disks would fit here in a two times two arrangement, two besides each other, the longer side still parallel to the PCIe slots, two on top of each other. The 3.5" is just too long with 147mm plus cabling, the 2.5" disks are only 140mm wide and the cabling is better placed for us.
On the left hand side, to help the video cards there's space for a 140mm fan. On the right hand side, depending on the CPU cooler size at least one or perhaps two 140mm fans should fit. Three 140mm, three 120mm fans, not too bad for airflow. If we can squeeze the Z10PE-D16 WS into a 20L case and cool it properly and quietly, that'd be quite a feat.
Edit: I have created an outline with the main features in Protocase designer. Dropbox - case.pda it shows where the PSU vs the motherboard vs the back fan.
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