Yes Jack that is why it is currently empty. We have the decking (sheet metal) just haven't had the time to build a fram and attach. Still debating on how we're going to attach it really.
I built one like yours.
I notched the framing so 1. It would sit down snug on the panel frame and 2. So I could "Metal Strap" it to the frame.
I hope this makes sense.
I had/have the exact same panel as you and it worked great.