Thought I would share my project. Have been looking for quite some time to replace deck. All in all, I decided to use plywood with a deck coating, that I hope works better than the "Home Depot" stuff. Instead of putting on any treated or marine grade ply, I went with 3/4" AC Plywood. I then found a deck treatment product at the local lumber yard. I have never used this, but thought I'd give it a shot. I coated the edges with at least 3 coats, the bottom side with one thick coat, and the top with 4 coats. I used two gallons, and it can be tinted whatever color you want. I chose black, to keep it simple. The product goes on very easy and dries pretty quickly. The whole project took most of the day and about a 6-pack of PBR....I couldn't find stainless screws, so just used sheet metal screws. I pre-drilled. Think I have approximately $200 into the costs, excluding the Superglide slides.