Gather info for my build

[Lou Smith]

Ok getting my ducks in a row, so I am planing to pour 4 ft cement piers in the ground then use 3” x 3” x 1/4 “square tubing for my stand legs. My cement top will be 72” x72” x4” thick I am building a 42” Pomfpeii oven. Has anybody built on piers and 3 inch tubing?

what size steel legs are portable ovens built on?