+1 for Steel over Stainless, It's cheaper and IMO a much better work surface than the thin SS skins they sell to cover wood tops.
I waited for the local steel shop to have some material close to the dimensions I needed, then had them cut it down to size. It's 1/8" thick mild steel (probably cold rolled since it was shiny when I got it) I countersunk some holes and bolted it through the wooden top with flat head allens on my Proto roll cab. I was afraid it was going to rust at first, but even in the hot/humid box factory that I worked at the time in St. Louis MO I never had any issues with rust.