bed blueprints?

[stixnstones]

I recently picked up a 67' c10 longbed. it is in rough shape. i would like to save the original box, but it will require a lot of metal work. the sides are not connected to the interior. I was hoping to find blueprints, or technical drawings so i could fabricate the necessary pieces to put the box back together. The truck has a wood bed, and i already have all the dimensions for that. What i really need is the dimensions for the bracing that holds the box together. any help would be very appreciated.