No, a 1u motherboard won't fit in a regular E-ATX tower case.
No, a 1u motherboard won't fit in a regular E-ATX tower case.
Could you try fitting a 1u server board into your tower case? If it works, what case would be best suited for this setup? Your item is available here: https://www.ebay.com/itm/235107192469
The mounts aren't properly aligned for the server motherboard to fit in the EATX case. You'll need to check the case, dimensions, and standoff positions, plus confirm if the motherboard screws will actually fit.
A few thoughts on the situation:
The motherboard I/O shield doesn’t fit your setup, and the power supply isn’t compatible either. The screw holes don’t match, and the power switch seems like a custom design. If you’re okay with welding and working with metal, you could replace the screw holes by adding new tin to the case back, carve space for the I/O and power supply, and then secure it properly. Building an Arduino to control the PC might also help.