A lot of the specific answers you’re looking for are dependent on the materials, fabrication processes, and quantity that you’ll need.
A few quick tips from my experience doing this…
-learn CAD well enough to make your parts and 3D print them if possible
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take your time on the prototypes and consider as many variables as you can (example, packaging and shipping costs)
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get your prototypes in front of as many potential consumers as you can to understand what people would really pay for this product.
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have as many people as you can test the product. You’ll likely be surprised at consumers using it in ways you hadn’t considered or intended
I have an alternative idea to solve for food deserts that I’m not going to pursue.
DM me if you’d like to do something with it