Model rocket

I decided to design this model rocket in my spare time so I could fly it and publish it. This is designed for an Estes A to C sised motor and should work well. I recomend ABS or petg for the body of the rocket if your printer works with those fillaments. Please give me advice on how to improve it. The new v2 version fits an engine inside of it better than the first one. Tell me if I should make one that flies on an D and E engine.