I installed the fuel tank behind the firewall which turns out to be in front of the instrument panel on the regular D model. I have the 150 3 cylinder installed. So the plane will have a slight CG shift in flight from nose heavy to more neutral by landing. I have all the RC stuff in the tail mostly and the air system split up. With this much added weight its not easy to just place things without some planning. Im installing a full cockpit so I had to make a compromise. Maybe in the Ghost its not necessary since there isn't much of a cockpit to be seen.