I, too, am curious, especially as to what you used for planking. PVC Planking? I hope you aren't using pressure-treated wood.
I also hope you put extra vinyl under your platform supports to prevent abrasion. If not, Home Depot sells Plumber's Vinyl that's used to shower stalls. It's at least 40 mils thick and is super-smooth. I use it under my drop-in steps. Or use can pieces of liner.

Carl