Did you "adjust" the shape of the z3 metal door skin? It bulges out in the center of the door and needs kicking in or cutting out otherwise the tribute door skin won't go on flat..That fibreglass to door fit is much better than mine - I've had to bend the edge of the Z3 door to get the clearance from the new bodywork and try to fit the fibre- even then there's a few mm (particularly at the bottom) wjere the z3 door sticks beyond the fibreglass