That is a slick set up for a sailboat, too much on my sneakbox.... I have a simple 15hp, pull start OB. I already made the tiller extension and it works well, but it would be fun to play with a shift mechanism that moves up with the tiller extension too. I have some ideas in my head, just need to find a push/pull cable that will do the job. So hold onto your broken cable if you don't mind, I try to meet up with you next week one evening, unless you want to stop down and see the sneakbox progress?
Dave