Hi Bill B, Glad you like my design. Please post some photos when you get it built. I like your idea for a free-standing adaptation for those who can't drive it into the ground.
This would work even with a platform under the box, by adding a floor plate and a male adpt.and if nessary use some plumbers strap to anchor side ways on each end.
Yes, yes, on wooden decks - lag bolts through the floor plate into wood, concrete patio - masonary bit and lead sinkers with lag bolts. Good thinking guys.