I would definitely say deeper than 13". ATX and possible E-ATX with hot-swappable 80mm fans would be ideal. I think 18" is the sweet spot for short depth.What other requirements you have; motherboard, PCIe cards, storage, power supply, etc?
I was designing some 2U's to put up on Amazon/NewEgg to compete with Rosewill, Chenbro, iStar, etc. and a model with 4x 80mm fans across the front was one of the options. However what I have drawn is only 13" deep for ATX motherboard w/ 6x PCIe slots and an SFX power supply.
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I was going to make some deeper cases for more storage, full height PCIe cards or 3-slot GPUs, etc.
If you can post more deets on what you want I can probably tie that into one of these designs!
I had seen this while doing some searches but can't find one anywhere to buy ! Seems that you have a micro-atx MB in there and can fit an ATX MB if you sacrifice the HDD cage. What is also nice is that you have a mix of FH and LP slot options in there.I brought these iStar chassis about 10years ago.
At the time, I did not know it was custom make to fit SuperMicro boards.
It uses SM flex 1u pws203 PS, front panel connectors plug into SM board without converter.
It has room for 80mm fans mounted on the left side of the systemboard,
there is a 80mm fan mount for the 2.5" drives cage.
My only regret today is that I only purchased 6 these case, I haven't see these cases in years.