I don't know of any but if you can build a car, you can build the box!
Here's mine. I don't know if this is to your liking. I made it out of an aluminum electrical panel box. I put a slant on the box so it looked more like part of the tunnel and less like a box. The lid is made out of 1/4" plywood with an aluminum liner. The whole thing is covered with carpet and held in place with 4 sheet metal screws to the tunnel aluminum. When I'm out somewhere, I throw the seat belts over it and it looks invisible. Detail: I made the lid about 1" deeper in the back and hinged it 1" forward so the lid sits flush to the back wall. Also, I did a mild radius on the front edge to eliminate the boxy look. It's really nice to have this storage space.
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