Cuppa. I made the box out of 6mm MDF. Once it was happy with the fit I covered it with marine carpet. And yes I will be using the original dummy cover as the door. I have hinged it but I ballsed up the placement on the holes I have to drill in the dash for the pins to run through so the door doesn't sit perfect. So I am fixing that up and the way I have made it you won't even know its there. You can't see the hinges, nothing. Until you push on the door and it springs back to open.