hi, has anybody had to beavertail the back of a merc 709 van? i need to do this to mine but dont know the best way of doing it. when i cut the back panel out do i need to put a brace in to stop it folding in due to the weight of the rear doors? if any body has had to do this and could help i would be very greatfull some pictures might help if any body has any of when they did there own, thanks 664howard