I did answer it. But my answer was about 3x in the exponent too large. The flagellum to fold and bind 30 proteins will take about 2^10000 trials. Translated to the fraction 2^-10000 or 18^10000/20^10000. This is conservative as we are not including the coordinated transcription that needs to take place.
This is assuming 50% of the residues will work in each position.