I want to build a carrying case for my 7 x 17 korona. I am not a wood worker and have a very simple plan. Thin plywood air-nailed using triangular strips inside for strength. Common hinges, latches, and foam. I would like to find corner hardware and angle trim. I have seen corner hardware on many types of cases but have no idea where to find it! Matching angle trim would be nice, but not necessary.