This is a really cool creative idea. I remember burning stuff with lenses as kid. It's much better than using lasers although the process is a very slow one. You are using renewable energy and large part of the product is wood. Therefor it has minimal impact on the environment. But you are only going to be able to use it while the sun is up. So it's less useful if you are living far from the equator. Good Hunt!
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thank you @vimukthi ...