The combination of the Exploded spacebar and the Chinese Win-key blockers reduces the amount of space we can use. Hence, 7u was not possible.
But it could still be possible to have this layout and support split spacebar (2.25 + 1.25 + 2.75)

I love the design but obviously this won't take a standard DZ60/etc PCB, so if there isn't split space support on the official PCB then this is no bueno for me.