Kinda concerned with pressure treated wood because it's corrosive, code requires galvanized or stainless fasteners and hardware in construction. Plus that $#!t is heavy, had to carry 16 foot 2x6, 2x8 through soft muddy backfill, really sucks, or sinks me down. Built alot of decks with Trex, the composite decking you described. Heavy material too, gets hot in summer and slick as snot on a doorknob in winter.