Thankyou everyone, but I've since found that I can buy the steel new for only about $30 more. So I'm going to go the new route as this means I can make nice round top plates out of 16mm plate.
Now as for welding.... My brother-in-law has a Mig welder and he's very confident he can weld this for me. Is there anything I should be aware of for welding such thick material?
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