Here is a picture of the first fin slot. it was a little hard to cut through the Kevlar this was my first time using it. so my Dremel had a little work out but it cut it

Another shot of the fin slot

Here is a picture of the fin template for the fins. it is through the wall for 9 inches then it angles up for the top shroud and at the back of the fin you can see a tab that will connect to the out side centering ring. the fins will be fiberglassed to the motor tube and to the airframe and to the out side centering ring. then it also has the tab on the out side of the fin to go into the 3 inch airframe between the 2 bottom fins

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