10.5 x 25 cnc plasma table retrofit

Little update I completed the sheet metal storage rack for my plate processing operation. Posted a few pics below. Going to get started on setting up the plasma table. I need to design a water table so I know what height to build the gantry to. Do you think it's worth it to obtain a few more of those steppers? I can hunt down more of these redbox machines to rob them from. Do you think they would have the power required to drive the gantry? I estimate it's 3-500 lbs I like the idea of high precision. I don't think I would save much money after wasting the time to aquire the redboxs tear them down etc but if there high quality components and really special it may be worth it. Got any expereince with water tables? Know of any good designs to work off of? Seems like a good amount of engineering is required to make sure it's strong enough to not collapse alot of weight is put on em aswell as I want to be able to raise and lower water height automatically, maybe even control it electronicly with electro pnumatic valves. 

For $214 a pop I can purchase 1000w 220v servo motors with drivers. Really does not seem to unreasonable I'm not really sure tho if this would be way overkill but I figure it's better to go bigger and work the motor less. I included a link below. Is there any disadvantage to running a set up like this? I think I will stick with the original motors to get the machine running but I'd like to understand more about servo vs stepper.

www.amazon.com/RATTMMOTOR-Encoder-Contro...54&sr=8-4&th=1&psc=1