Wow Trev, this is gonna be brilliant. As much as. 10 footer in the middle would be cool I actually think your tanks need to be where you spend most of your time. In my main lounge / cinema room I spend most of my time so my tank is there so I view them all the time and enjoy the fish that way, I am not sure I would see them enough in another room.
Have you got fresh water feed and drain etc? Are these going to be linked on one central filter? If not how?
Please post up when finished as this should be one of the best rooms ever.