It needs to bee able to fit a 240 radiater, a strix gtx 1080 ti from Asus (vertically), 2 ssds, a reservoir and a pump, im wiling to provide more info if needed.
You would need to provide sizes for all of the components exactly including standard measurements and fittings for motherboard type, SSD clamp sizes and everything else in between. Also as many ‘off the shelf’ components you can find measurements for the better.
Parts like this are engineered to perfection as everything needs to line up and fit exactly, generally things like this would be prototyped first before a final build was made. I would be careful trying to have somebody make a case for you, then pay for it only to find it’s off by 5mm and a component wont fit.