I love what you did in the trunk, I may have to borrow some ideas here. I was looking to do something very similar on my coupe. The notchback coupe and convertible share the same trunk lid and opening. My fuel tank comes up 4" into the trunk, I was planning to make a false floor panel over the top, then making side and rear panels similar to what you have done. Are the panels aluminum?
What is the windshield wiper reservoir from? I like hiding it here. Is it much pain to run the hose to the front?