After seeing a few examples on here, I thought I'd try my hand at a rear bench for when I'm out camping etc.

Its 7mm ply for the backing and 10mm ply for the shelf with 100mm stainless hinges and a few stainless fittings.

I removed the old rear panel and replaced all the outside edge push in mounting holes with 6mm steel nutserts and it came up a treat.
I ran out of 6mm nutserts so thats why there are a few screws left out for now.
I'm thinking I'll just paint it a similar color to the interior and glue thin rubber matting to the shelf.

All up, it took a few hours over 2 days.