Hot Rod, I riveted the sides every 16" matching the side skins and on top used a countersunk screw at 16" OC,then sealed. I was not really pleased with the cast corners. I purchased the castings and the preformed corner material from the trailer maufacturer, assuming they would match. The radius on the casting is slightly larger than the corner material and will require some sealant to fill the gap. Also, had to grind the castings to fit the top trim as that didn't match very well either. I guess I should have looked at my trailer a little closer. It's the same way. Tolerable but annoying. MMM
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