There is plenty of room for a pump and res with a graphics card that isn't the size of the Empire State Building lying sideways. You even have room in the tophat with a rad slid all the way back. There is a good sized gap there and should be able to fit a small pump in. This is without measurements of course so we will have to see what Jay ends up doing.
Sounded to me like Jay is going to do two AIOs instead of a custom watercooled loop. I hope I'm wrong though. I would love some ideas on how to fit a custom watercooled loop inside this case.