I've made a lot of things over the years, of course they were all made from some type of metal.
I made myself a charcoal grill out of a stainless steel beer keg about 22 years ago. Mounted it on a steel frame with wheels. Still got it; I've had several people want to buy it over the years.
I've probably grilled on it 6-700 times, and with it being stainless it will practically last forever.
Sounds like you could market and sell that.