Decided not to go with the hot glue...never know when it's gonna give out if it's the main support.
Put in some support rails that I glued and screwed into the main rails. Installed the 2 PVC pipes and then screwed those to the new rails. Screwed the top Coroplast to the rails. Added in the support ribs to keep the top Coroplast from caving in. This should work fer now...