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High rigidity is more necessary for cutting parts with a router than printing especially at slow speeds. Conduit is super cheap, just make a set of 1ft and a set of 2ft legs. A whole second set is like $2 worth of conduit.
ACME rods in all 4 corners is extremely interesting but may be harder to achieve than you think. Many printers have enough issues with just 2 that are in a line with each other let alone 4 in a square. Additionally you would need to upgrade your stepper driving system for the z axis. The ramps board has dual outputs for the z axis since most printers use 2 steppers on the z. But that is doing the same thing that we do by wiring them in parallel. I would be extremely hesitant to put 4 steppers on 1 driver. Although, the worst case scenario is destroying like $40 worth of electronics and possibly causing a small fire, sounds like fun to me.
If you go the 4 z axis stepper way, you might be able to run wires from where the z stepper driver plugs into the ramps board out to an external stepper driver that is rated for 4 steppers (may require power from a source other than the ramps board).