I found some of the cast aluminum upper corner for both front and back of the box, plus the rounded stainless caps (they also had diamond plate) for the uprights at an RV surplus place near Elkhart. The name escapes me just now, but they were a couple miles west of Bontrager's Surplus in White Pigeon, MI (just over the line). They had a selection of surplus corners and you kind of had to dig through the bin and find some that had the shape you were after, then dig through the stack of sheet metal... you get the idea. Got mine that way for cheap. All those surplus places have websites too, just google something like elkhart rv surplus.
Daddy has a good idea too, find a brand of enclosed trailer that uses something like you want, and call them for "replacement parts for your trailer".
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