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Many people that use sheds and other sheet metal clad constructs seem to have problem with condensation--I definitely did with my composite panel box.
I think it's a couple of factors, but one of them is the metal itself. I think the sun hits the metal, which in turn heats up the air in the box very rapidly. Then you have a cold chunk of metal (your mount), probably connected to a very large chunk of cold concrete (your pier) all of which is heating up much more slowly than that air. From there, all that moist air condenses on your equipment.
So, by using ply instead of sheet metal I hope to slow down that initial temperature increase by virtue of the ply being a bit more insulative than sheet metal. There's many ways to skin a cat, but this is an easy one to do *shrug*
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