Welcome to the forum and sorry to hear about your problems. Sadly this is all too typical of the boating industry. However, I would say that a good proportion of the items you have listed as faults are found on many other boats but some of the faults like the keel banding, steering gear and electrical problems are not acceptable on any boat
We have a forumite hereabouts, gludy, who has some experience of litigating against boat dealers so maybe worth sending him a PM (private message) and asking for his advice. Otherwise I suggest that you contact a good marine lawyor like Ward & McKenzie . Good luck and keep the forum posted on developments