The one I built has a saito 91 for power- 3004 servos all around with 2 in the wings- rudder servo in the tail- battery under wing bolts to ballance .25" behind recommended. The human scale says 5 lbs. the fish scale says 5.5 lbs. take your pick.
With a 14x6 prop it will hang all day under half throttle. Floats in almost like a trainer.
Build it straight and light and you'll love it.
Eric