Forward CofG is a problem on Warrior II's and III's when they moved the battery from the back to the engine compartment (amongst other things)
See if you can find a decent Warrior I or Cherokee, else do what we do and fill up some 5 litre water bottles for the baggage area, or a life raft or, as we were forced to do once, 3 cases of Carlsberg (not to be confused with in flight catering!!)