I did discover that laying out the panels for the sides involved a more flexible batten than the one I was using, and decided to use a thinner one lying in the back of the garage and redo the curvatures. All panels are now cut out along with frames and transom.
My technique is to saw about 1/16" outside the drawn line and then use a block plane and Stanley surform to fair to the line. I then sand the edges lightly to ease the handling of the panels. Apart for getting a CNC cutter, there is not much else I can do here.
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My technique is to saw about 1/16" outside the drawn line and then use a block plane and Stanley surform to fair to the line. I then sand the edges lightly to ease the handling of the panels. Apart for getting a CNC cutter, there is not much else I can do here.

Start by laying out a 12X12 grid, you will discover the real size of your panel
circle the marks clearly where the brads for the bending batten will be placed.
1 hour later - this panel was fully laid out and ready to