I got my ROBO 2-4 years ago with this plastic base plate that was warped since day one. As i heat the bed, it gets warped more. So today i finaly deciced to take it all apart and replace the base with something else. I dont want to pay hundred dollars for enough aluminum or slightly less for regular metal, but i want to replace it with BETTER plastic that will not warp from the heat of the bed and from tension of the belt etc. any advice ?