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The front part of the fuselage must be printed upside down. It does not go with a sharp nose unless you split this part in two pieces.
Furthermore it is a huge effort to modify this part.
What I can do, is to add a nose like a spinner which you can fill with lead bullets and mount to the motor plate.
This way you have both - a pure glider and motor driven.
I uploaded "glider fuselage test.stl" to see how it would look like.