What's it going to weigh?

Freeships will get me part of the way. It allows for input of material density and thickness which it combines with developed surface areas to obtain a total weight as in the table below.

 The rest I'll have to do by hand, or using excel, in this case. The cleats will do on top of the bulkheads to strengthen the plywood edge and give a good gluing surface. The support beams will be spruce or pine crosspieces to support the thin seat plywood--I'm going with a beam every 6 inches which is close to Skene's scantlings. Next is I'm going to cover the plywood with thin fiberglass weave two coats of epoxy and another layer just on the bottom with one coat for traction and to strengthen to bottom. According to my original Gougeon brothers Boat Construction a pound of epoxy covers about 35 sq feet, I've got 52 sq feet in the planking. Add long strips of wood for the inner and outer gunwales. I added a pound for the 4 bronze oarlocks I'm going to canalize off one of my rotted hulls.

Add it all up and wow! I'm at 71 pounds. Of course I haven't added the fiberglass tape on the seams, nor breast hooks and paint of course but 75 to 80 pounds looks realistic. Nice. 

Next time I'm going to show the plywood layout.