I'm looking at a couple different Cab A's and Cab B's for sale. From what I can tell, the main differences are that the Cab A has some wood in the frame, a smaller back seat, and no back windows. The Cab A is also about 30% more than the Cab B, and is probably more attractive with the top up. Is the fact of all-steel construction of the Cab B something to consider, e.g., less of a risk of wood rot? Just trying to decide, I suppose, whether there is a good reason to spend extra $$ on getting a Cab A. Any thoughts are appreciated. Thanks!