A fully loaded workshop play space See there? You could disguise that and use it in a traditional room. What is it? It's a "floor sweep". Simply sweep the crap into the box and the dust collector sucks it up.
DIY 550 gallon rainwater retention system from LDSPrepper. He shows step-by-step how to capture rainwater, filter it and store it for long-term use. He has 3 of these setups for 1650 gallons of water year-round. It's surprisingly simple to do.