I know everyone's tired of hearing about it but it looks like I'll be building these bins out of 2x4s, presswood, and a pallet. I built 3d renders of each material based on a bin thats 48x48x72" and the wooden one was the cheapest. $50 vs $1k for the plastic and about as much for the steel one. Just waiting to hear back from some folks about wither parking lots are considered public domain and if so, if I can place collection bins there. I'm giddy something's starting to stick. Thanks Matador for the idea ^.-