Beautiful work! Did you build up the entire trunk lid by your self to?
I only extended it 3" and added the duck tail. When the bottom curves under it returns to the stock position. What I mean is the top skin is redesigned but the underside of the lid is a mold of the stock trunk so it closes onto the stock weatherstripping. With the added design the new glass trunk is exactly the same weight as the stock steel trunk. 20lbs.
In this photo you can see where the original trunk underside stopped and how much longer I made it. I will build a filler piece and mend it in so it can be extended to meet the top skin and then added to the original mold.