The bottom of Page 7 has the overhead view showing the taper from the root edge to the outside edge.
It's up to you - on this "flight" version build, I didn't sand this taper. The raised center line won't be as apparent on a thinner fin.
If you want to shape this profile:
This root edge to outside edge taper (shown above) should be formed before sanding the diamond profile shown below.
Here's how the second stage fins look after shaping with the sanding block.
Notice the glued lamination lines that show when the taper is sanded in. It's another good reference to help judge the thickness while sanding.
Whoops! Be careful near the root end tips.
I had one fin tip break off down the grain line.
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