So much for the pre-build lecture
I don't know about all of you, but I think its time to start making some sawdust.
I started out by tracing the parts out from the part sheet with tracing paper and a pencil. This was followed by going back over the traced outlines again, this time with carbon paper between the tracing paper and the 1/16th ply. When I had transferred the sponson insides and one set of engine bay sides to the plywood, I took them outside and, using a jig saw, roughly cut out the sponson insides. The parts were then taken into the garage and were finished on the rear and bottom edges using a band saw and belt sander hooked up to a shopvac.
At this point, due to my curled plywood, I felt was the time to start attaching stringers to the sponson insides. Along the front of the sponson, a series of relief cuts were required to make the spruce bend as required. One thing I'd like to point out is the flat building jig I've used to clamp the wood to. This is from the Sport 40 pictured earlier.