If you do not try you can't know...

Done my first development and looked at the result :
It looks deceiving. I'm missing some sharpness in the negatives. The question is now: are the pictures unsharp or was my scanning a lousy job. Probably both parameters will have influenced the result. Next step : put a new film in the camera and start again a serie of test pictures with a frame diagram on the wall. Then test the sharpness of the camera.