Cinder blocks are cheap and plastic bottles are recyclable. I don't see the point and I worry about the safety for anyone under the walls. No rebar, no aggregate, and nothing to prevent cracks. Bad idea. You would never lay a brick wall like that, so bottles will work better? All they need is a wolf with a healthy set of lungs and it's game over.
That "window" with the kids sitting on it is a point of failure for sure.
That "window" with the kids sitting on it is a point of failure for sure.
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