Why do you think you need 4 stepper motors? How do you intend to attach them to the object? How fast do you need to raise and lower the object? What distances? How much control do you need for both speed and distance?
I built this several years ago to raise and lower a 40 pound solder pot and uses only a 12 volt storage battery, 4 relays, a reversible motor, and a control.
Can you add a drawing of your project?
Paul