Well I’m no engineer, but it would seem to me, one would want the level of the concrete to be level not with the (bottom) of the bin cover - but with the top?
Nice idea though. Bet it does catch on, actually. Heck, seems you could pull of a DIY version over a weekend with a trip to Home Depot.
I agree. Easy to throw stones at...until you ask people to come up with a better idea for that situation.