There are a million ways to set up some recyclables and an aquarium pump to grow a few plants. I've done this plenty of times. It wasn't good enough for the power it was using, and the materials never lasted that long. Plastic bottles are only intended to be used once - many bottles even say to not reuse them on the label. This system does use new materials for the initial build, but once it's set up it only requires water, fertilizer, seeds/cuttings and the occasional sheet of rockwool from then on out. Using new materials also reduces the chances that surprise contaminants will make it into the food (at the very least it should be better than grocery store equivalents.) The pump is solar powered - it pulls the solution from the reservoir below to trickle over the roots of the plants inside the box. The footprint is 36" by 8" and it accommodates 50 plants. The inspiration came from a book of old French ironwork that I have. I figured that if I was going to do this I might as well make it as spectacular as I could. I'm running it outdoors over the summer, but then it's coming inside to keep working near a sunny window to keep me eating fresh and healthy all year long.
*After a last frost over 20 days past the 'normal' they tell you to plan for when you garden the weather here has finally gotten nice! It froze one night and was over 90 degrees the next day, so now I have pictures of everything up and running! Yay!*