A dry fit of the fins show the body tube sticks out a bit longer than the end of the root edge.
I really wanted the trailing edges even with the end of the engine mount tube.
Rather than try to cut a sliver off the tube, the engine hook was pulled back and the tube sanded with 220 grit on a block.
Earlier I had reinforced the inside lip of the tube with some medium CA glue.
This made a stiffer ended tube that would stand up to the 220 grit sanding without tearing or fuzzing up.
smoothing with 400 grit followed.
It's hard to get an even fillet on the root edge at the centering ring step.
I used another Q-tip to remove the excess glue.
Use the Q-tip once and throw it away.
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