I think we should powder coat it anyway.
In the daylight, I found about half a dozen more scuff marks, and a couple of scratches that didn't go thru the paint like the first pic I posted. So I went ahead and dry mounted the pan so I could move forward with building the cart. The pan sits 1/2" off the deck.
Edit: Shout out to @kulangot for his recommendation that I purchase a battery-powered impact driver. I bought it two years ago, but didn't get to use it before. Setting the long lag screws [and even the short ones] in the wood was no longer a ratchet-fest. DeWalt 18v buzzed it together, aided by a framing nailer for the main structure.

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