[Nonhog]

Just wondering how the bed comes apart on a 63 Chevy truck.
Have a patch panel that rolls up at the body line. It seems that the intent of the patch maker was to attach the repair (patch) panel under the body line.
Does the upper and lower bed side come apart? see arrow on pic.
I've Googled and tried many websites to see if I can find a blow up and so far no luck.
Looking for ideas on approaching this repair.
(hope this makes sense)