On your left it's OK, on your right it's NOT OK (white):
We must glued both side together very strongly, and hope...(The underside of the plane is not glued together).
I ask myself if I am not going to take away the plate to do it again in plastic card. The top of the plate is difficult to sand and the angle must be right-angled:
I did again the plate:
I have blacken it with a pencil and put over a piece of scotch tape to take a print.
I glued it on a plastic leaf and cut the new plate.
A+