The benches are pretty simple as well.  You just want to follow the curve of your transom.  This might be different slightly from model to model.  First,  you add one of the bench sides to the side of the rudder trunk.  See below.   Note how the top aft point of the side is even with the break along the inboard counter.     At the same time,  assemble the front panel for the bench with the other side.  Have it ready to glue into position.  It will sit on top of the lower counter.  But