I am looking at purchasing a second hand Sky Master L-39 kit that is atleast one year old ( not entirely sure of the actual age but probably about one year). I know that Skymaster had made a lot of changes and improvments in this kit over the last 2 plus years. The question is would a one year old kit likely be the same or nearly the same as far as mods and improvements as a new one purchased today and how can I tell if the older one is up to date so to speak ?