WOW! What a nice, nice looking car. I HATE body work, it is work,work,work, but you have a real looker as a result...
What material did you make the tonneau from? I suggest making removable plugs for the top cutouts, pop them out and store them when the top is up, makes it look much more finished. Rather than squares, you could make a decorative piece to fit the corners...
Keep updates coming, I like it!...Chris