It looks like a good start. I'll just second a few comments others have made.

First, clean the box up. Get the grommets in there and route the wires neatly. There is nothing better than looking at your work with the pride of a job well and neatly done. It took me a while, with the help of an electrician friend, to figure out what craftsmanship in wiring was, but you know it when you see it.

Second, Use some earth anchors and cable to hold down those panels. I had a similar setup. The wind flipped it and I was lucky to only loose one panel. It can never happen until it does.