Quickly subscribed this thread.
I was starting same project back then 2015-2016 when building my hackintosh. My hackintosh is put inside my 2010 cheese grater dead machine. Instead of replacing damaged boards I’m initiated to transform something different.
My design is bit different, but fundamentally same.
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Mounted :
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Regarding FireWire 800 ports, on my front board is just for cosmetics setup only. It have no wiring since firewire connectivity on my hackintosh supplied from PCIe FireWire cards.
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Re purposing with USB type C ports would be nice, but required me to adding some additional housing, light grey ABS plastics would be good.