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Maybe not as durable, but perhaps a couple of pieces of sandwiched corrugated plastic coroplast from a sign shop would be cheap and stiff to let you mount and design how you see fit, and rigid enough for the short to medium term to see how it works. But finding the widest lawn edging to meet meets would be best.
This way you can make it as wide as you need, or go the big Dave way and go with it lower in front of tires and not as low in middle.
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