Update #3:10/4. Fins tacked, some filleted. Tonight I cut out the fins and glued them onto the booster. Here the first fin has been glued down. I found that using the fin placement guide helped a lot in making fillets. The fillets actually look really nice so far! Tell me what you think of them. This fin took two tries to glue in. For some reason, it didn't stick the first time so I had to take it off and clean everything up with a wet paper towel and then sand a little. I got it tacked on succesfully, and I think it will be pretty solid once it is filleted.