That looks fantastic!

What are the box and lid made of? It looks like fiberglass.... or is it sheet metal, Wood?
I noticed the 12V battery on the front and the wires that go into the box - but I didn't see any lights -what do you use it for?
The hydraulic lifts for the lid are a great idea - where did you get them? What type etc?

I'm looking at buying a small trailer too and I'm going to be upgrading it along the same lines so what ever details you can add would be appreciated.