Normally I wouldn't cut fins with scissors.
But this plywood is only 1/32" thick! It cuts easily if your scissors are sharp.
It was fairly easy to sand an airfoil in the fins. The interior color layers make a good depth gauge when sanding.
If you are inexperienced in airfoil sanding, cut out a few extras for practice.
I used 220 grit on my Great Planes Easy Sanding block.
The upper left corner was rounded off. No reason, I thought it looked sleeker.
Here's a closeup of the airfoil.
The outside edge (to the left) is also tapered.
The side view shows the airfoil taper from the root edge.
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