There are any number of "wacky-wood," bending plywood sheet products that you could use for the leading edge of your bracket mold to accommodate the transom curvature.
Use a scribing tool to mark your lines on top an bottom to nail down that radius for your horizontal panels.
Heck, I think one of the brand names of these sheets is "Radius." Do a search for bendable plywood...
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there's no such thing as normal anymore...
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