rear measurements

[peppers]

so the 80 malibu i got at one time was a moving speaker. after starting deconstruction to get everything to metal i realized all the metal for the rear deck and rear seats was removed and replaced with 1/2" plywood. obviously this does not fly with me so before i start fabricating stuff does anyone have the factory measurements of this area? id like to make sure everything is in spec before welding it up

 

[pontiacgp]

if I am fabricating pieces like that I make a cardboard template and transfer that shape to the metal

 

[peppers]

I've done that in the past replacing damaged parts. This is something new. The guy cut all the braces and sheet metal out. It's like an El Camino except for the exterior body. I want to make sure there was no twist or damage done to the body which is why I asked for stock or factory measurements