box 400-500
spinner plate 230+vat
welding 400-500
front prop50
gearbox mount 50
rear prop mines fancy 250
center push clutch depends wot you use 130-200 quid
pump for box 100
plus pipes and controlers martin dose one for 250
but you can do it cheaper like me
not cheap conversion but when i did mine no other boxs are good for 500 hp