On the cowls, I cut out one cowl around the engine. Then I pulled a clear plastic vacuume formed over one that has'nt been cut out yet. I take the clear molded cowl and pop it onto the one that has been cut out for the engine. Taking a fine marker I trace the cut out outline, remove and cut the clear cowl. Now I have a perfect template to pop onto the remaining 3 cowls and trace with marker, cut the 3 fiberglass cowls and wa la 3 identical cowls without guessing or trial and errors. I also added a 1/8" lite ply ring to the front of each cowl to stiffen up and close the gap between the cowl and back of spinner.

Gunny