My center I believe is the version before yours, but you can make that work forsure. You could open it up where it says m on one side and L on the other to slide the tanks in.
Or see if you can get them in behind the motor on both sides and if need be you can add weight in the front cavities.
Why not make one tank that would sit down over the drive line make the tank with a tunnel down threw the middle of the tank that would be real easy to do and utilize all your space