I used some leftover carbon cloth to make a little bracket for the tiller, near the rudder stock.
The bracket connects the two sides of the tiller to handle torsion loads. It also creates a local reinforcement of the tiller for a rudder stop (a simple rope attached to the eye bolts).
I also test fitted the carbon goose neck fitting on the boom. It’s a bit scary drilling holes in an almost finished carbon boom ….. I had to drill the holes in the solid laminate, not in the fragile foam sandwich. That worked out OK.