“Composite Dave” corrected me on a couple things.
One, there’s no requirement to use one sheet of a layer; using smaller pieces and overlapping them by 1″+ is perfectly reasonable, especially for something which isn’t hardcore structural in nature.
Two, he warned me about painting composite a dark color, where sitting in the sun can cause the epoxy to soften. Not enough to melt exactly, but enough that it can slowly flow/bend/sag if there’s a load on it, taking a set in a different shape once it cools. For this reason I’ll go with the lime green, which is okay by me 🙂