Agreed. It's what we use for our cutting boards. Really good stuff. Not cheap, though, and you need good sharp tooling to work it and not burn it. I have plans to bring a tailgate cover to market made from it, but it will be a while yet. My CNC guy is changing locations, and won't be open for business for at least another month. It's an easy diy, though, with the right tooling. I'd use nutserts w/spacers to attach it in the stock locations.
I've tested HDPE, and I personally don't like it. It's not very strong at all.