Gary,
I have just about completed the transom/stern framing. Assuming your kit is the same, you will need to add 3/32" square stock to the aft end of stern frames 3,4,5, and 6 as indicated on the drawings. However, the drawings are not as clear regarding the addition of 3/16" square stock to the aft edges of frames 1 and 2. The objective is to achieve a flat, or mildly convex, aft face to the transom, ready for planking. Install said square stock on the frame aft faces followed by the transom edges detailed on the drawings. Shape these edges to match the drawings since they will be used to help establish the arc of the transom top. Fair in the entire assembly face to achieve a flat, or slightly convex shape, if desired.
The final shape of the transom top will be determined by the height of the transom edge pieces at the sides and the lengths of the square stock frame extensions. You can measure off the drawings for these heights.
WQ3296