I’ve been doing weight checks on my walrus.
Frame with floor ready to be covered. Frame is coated with epoxy: 24 lbs
Canvas skin attached: 7 lbs
First coat of paint applied: 2 lbs
Cowling, rub strips, keel strips and mounting screws: 4.5 lbs

Put this all together with 3 applications of paint or sealant and final weight comes out to 41.5 lbs

Almost half the weight takes place after the frame and floor is complete. next time I do not plan on coating the frame with epoxy. This added a lot of weight. I could cut even more weight by using a synthetic skin.