go to the local steel supply place, they always have "scrap" piles they let you go through and buy from on the cheap. usually their scrap is cut offs and such that are perfect for garage type construction projects. Northern tool sells the key shafts I think, mailed to yer door
have fun and post up build photos
I just did a google of ply mass, there are a lot of metal fabricator places of various types, maybe might find one close and places like that would probably give ya 4" square scrap, I know I would. They buy their metal somewhere close you can bet.
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