This is the best DIY dustpan video so far. He makes it from a canister, and cuts the canister in a way that will take advantage of the bends and corners already molded into the canister. He uses wood for the handle, and attaches it with screws; I hope he’s using washers.
The design is similar to the homemade dustpans made from large, 5 gallon soy sauce (shoyu) cans, which, in the past, were made of steel.
This style of dustpan is great, because they are durable, and can be repaired. They can be lifelong dustpans, and made with scrap material and maybe $2 – $5 worth of hardware.
I’ve seen the old style steel can dustpans selling for $15 at estate sales. Again, they were probably made with scrap materials and minimal hardware.