I prepared a synthetic ribbon to cover the edge. I ironed it in half. At the side that should go to the upper half of the rocket, I didn't iron it straight but bend it instead.
It's a strange feeling to sew with right sides of the fabric out... The ironing trick made my life a lot easier, especially at the curved sections :-)
This is it. Maybe I'll add a bootstrap once.
I'm looking forward like a child to play with my new racket for the first time!