I've not personally seen seen any cases that large (tall and deep front to back) with that much room for assorted radiators...; with interior PSU cables buit in, and the case's tall height and deep dimensions they appear to specialize in this niche ' i want 3 large radiators and lots of darn room' market. If anyone does make/ sell cases like that, I'd anticipate $600-$800 cost....
Presumably, if you want a case that big, you intend to do something similar yourself, and save the $1200-$1800 markup!
Good luck!