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I would say use the calculator and add 1″ minimum to the table dimensions, That would give you probably 1/2″ clearance from your box.
Height depends on your stepper motor size. So z rail length + leg length + motor length + plus a little extra 2-3″ for breathing room.
You can do whatever you want with the feet, screws out is generally the strongest option. With 8 screws holding it down each one sees very little force.