This little boat is well intended to be a light weight, easy to handle, minimalist boat for exploring sheltered ponds, lakes, and bays. I built the prototype using basswood and walnut using 1/8 inch thick strips and it came in at about 15 pounds. Even using thicker cedar it should be easy for most builders to keep her under 20 pounds. Skilled builders willing to push the limits may be able to shave a couple more pounds off.
I think people will find this to be a fun project. If you need a bigger boat it should be easy enough to stretch out the design a bit for more capacity