Ok, here's the technical part: The floor.
Rather than go with heavy 3/4" marine plywood, I went with a 4'x8' sheet of King Starlite XL from Total Plastics Corp. (or Co., I don't remember). 3/8" thick plastic at $100 a pop. Now you might say, "3/8?! Way too thin!" Thing is, I'm making up for...