its going to be an amphibious craft at stage three ,after the retractable undercarage is designed(got any light weight designs lying around? ) l have balanced the forces with careful and calculus positioning of the engine thrustline &c/g ,tail incidence,ect,ect,and the fuse will contribute to lift in front of c/p of wings.(building is a compromise,theres no ware else to put the motor,and keep the weight down to 328 kgs empty.) When l started the idea we were all expecting 760kg. Weight increase to happen .Mike.