Joe, I geuss what I meant to say was that... whatever you want to call the line that is the meeting place of the top of the plate and outside vertical side of the plate, this line falls in the plane that is defined by the tops of the rafters. The rafter plate arrangement that Jack uses for the shed is the same that can be found in his historical joinery essay figure 9 (chapter on rafters). If I drop a chalk line along the plate at any location and use it as a reference then the rafter seats will be 3/16" lower/deeper towards the middle of the plate than at the ends due to the crown. I think this will result in the "line" (plate top/side intersection) being above the rafter tops by 3/16" at the middle of the plate.

Norm Hart