The back end of the interior ridges are lightly trimmed to allow the fins to slide in.
Uh-oh! The fin rails are off the model.
I tried to slide the fins in, but the fit was too tight. The glue on the base of the rails on didn't hold when the fins were pushed in.
I ended up removing the remaining contact cement off the rocket body.
On the left is a sliver of the fin rail so you can see the interior profile. The bottom is curved to fit the engine body.
The lower inside ribs were filed down to allow the fin to slide in easier. I could have sanded the fins thinner, but I didn't want to weaken the root edge and have to finish them again.
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