aloha
if have and found it to be fun to make and play with
i started with metal fashing sold in roles it's cheep and you can learn with it
after i made up some ideas i wanted to use some heaver stainless steel so i took my proto type made of the sheet steel to a sheet metal shop
and had them cut and punch the metal bands out for me
they have tools and more skills then i have
most shops are cheaper then you think and will do a incredibly precise job
you can buy uncut sheets of any kind of metals and do it our self as well
i suggest you buy a set of metal hole punches and a staright bladed metal cutters i have found it easer then the left right center kind for smaller pieces it makes the work a lot easer
hope this helps