This epic monstrosity looks like total overkill, but somehow I'd expect it to have more internal drive bays. It looks like it could probably have like 3 more. Look at the distance between the PSU and the front wall. There could be like 4 hard drives in there, if they'd be mounted sort of like sideways, so that all the plugs and connectors would be at the side of the case.

Also, most people who'd see that thing would probably be like me and ask why anyone would need that huge top compartment, because water cooling alone shouldn't take THAT much space. So it would be convenient if the big flat side of the top compartment would be a window. And if someone does have an additional little system up there, then all the more reason to put a big window there.

There should be a bigger window in the lower side. That frame that holds the filter doesn't look too transparent.

Pretty neat idea but I think the dual mobo hybrids would be a bit more money and space efficient. They're too few and far between though.