You need to talk to a electronics manufacturing company, they can work with you on the design, but it's probably not going to be cheap unless you do the PCB and case design yourself , spreading the cost across 10 or more units is the usual practice.
Something like this?
https://www.scan.co.uk/products/fractal-design-focus-g-blue-atx-computer-chassis-with-window-2x120mm-silent-fans-usb-30-usb20
Just need to buy a couple more fans but has decent airflow.
The two Flexi cables are for the Blu-ray drive, easy to find replacements on eBay. The HDD in the PS4 use standard sata connectors.
Teardown here. https://www.ifixit.com/Guide/PlayStation+4+CUH-1200+Entire+Console+Disassembly/52475
Unless you were wearing nylon socks and rubbing your feet on a nylon carpet before you touched the motherboard then you've got no worries, ESD damage us incredibly rare, most PCBs are designed with large earth planes that tend to absorb most normally generated static electricity. Unless you're...