The U support pieces have to be tapered to fit inside the fin half joint.
Notice in the inset drawing -
The outside corners aren't really seen, set down inside the joint edge.
Here's the piece dry fit before sanding in the tapered sides.
It fits too high, outside the the fin half joint.
I marked the fin sides so I could see what was being sanded off.
That black inked edge gives you a visual guide to keep the angle even.
The left side picture shows the sanded angle about halfway through.
On the right is after more sanding, just a bit of the black remains.
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