Hi. Post it's old but worth to write. First sorry my English.
Im Polish angler and in my country is really popular make homemade spinner lures. We use a brass, copper and stainless steel or mild steel.
Thick plate what im use is 1.5 to 3 mm depens hov long and weight lure you wont.
My advice is if you write on youtube on my language " jak zrobić obrotówke na morskie trocie" or "jak zrobić wahadłówke"
We use "spoon" lures for many spieces of fish. Sea trout ,garfish, pike etc.
Im make self lures sometime.
Im hope im can help you litlle bit.