Awesome! I am in the midst of my similar plan. Though, being more transient and a contract worker, no parting gift for me. So I will split Mexico and CA north of the Darien into one trip and leave America Sur for another year.
Sounds like you have planned thoroughly, and even liaised with those who have gone before. I am envious of your new steed, and I hope it is the perfect companion for this trip.
Perhaps we will cross paths on this trip. I am in Mexico, and will probably be in Guatemala until late September, in escuela de espanol.