Finally decided on my deck material. Checked out aluminum scaffold planks, bleacher seats, aluminum decking for homes, all too expensive. So I looked in my backyard "parts department, and found the aluminum ramp that was in my truck when I got it. Measured it, was within an inch of what I had already planned for. So about 6 hours with a plasma cutter, sawsall and a hacksaw, I now have a deck. Still need to frame the perimeter and bolt it down, but it is roughed in. Will be carpeted once everything is in place, so the surface doesn't matter to me. Will next be framing supports for a roof and screened sides. Will hinge the ladder on the left side with a screen door inboard of that. Will have expanded aluminum mesh on the exterior to protect the screen and conceal it some. Then over that, roll down canvas. Lot to do yet.