Here is another site that has information on the measurements of the bed wood, can't have too much info.
https://gmcpauls.com/47-72_BedWood_Info.htm
I like the process of giving the wood 3 coats of por15 to seal it, was this done to all sides prior to installation or after they were laid down. If done prior, did it effect installation fitment any?
thanks,
gg