All are what you think man. Why you can think PCIE riser take 30mm height? You never seen some thing like that?:You can't "adjust" the gap between mainboard and GPU to negative 6mm. If the CPU cooler is 37mm thick, the mainboard (including the m.2 on the back, the CPU socket and the CPU itself) 15mm, the riser 2mm and the GPU 42mm: That's 96mm without any gap between the components or the frame.
I now understand how you want to mount the motherboard to the frame. But I don't think it's a good idea. 50mm standoffs screwed into a 2mm steel strip won't give you the stiffness you want for the motherboard, the torsional force is just to high. Plus I see the standoffs potentially colliding with the riser PCB or limiting GPU height.
(For example: 176mm inner height - 8mm on top and bottom for standoffs - 30mm height of riser pcb leaves you with a max GPU height of 130mm. Depending on how the height is measured an MSI Gaming X might not fit (the 1080 variety, the 1080ti is to thick anyway))
You never seen some thing thin like that?:
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