thanks to both. its rough on the outside, i used reclaimed pine for the case. it does bang around in the bed of the truck fairly frequently.
the inside is lined with upholstery material laid over soft padding which, in turn, is laid over carved blue board foam and spray foam insulation.
i still plan on padding the inside of the lid, and adding steel case corners like the ones found on heavy duty instrument cases. the case holds everything you need for a few days at the range.
lots of spray foam, spray glue, and a weekend.