Effort to make a house from the SF Bay Bridge scrap

Is there a lot of lead in this steel? Or is it the paint or something?

I wonder if this would end up being an environmental win vs recycling the scrap. You would end up with a house made out of an epic amount of steel, which is pretty expensive.

Actually houses seems like a rather dumb thing to try to build out of this sort of material. Need something that will get more out of the industrial strength nature of the material. Maybe a park? Could build benches, tables, shelters, stages, climbing structures, etc.