I have an import "Bridgeport" that's a little worn out, I would like to convert it to CNC with ball screws and instead of working with sloppy dovetails I was thinking of mounting a pair of some linear rails to the bottom of the bed and 4 linear bearings (2 each rail) for the X axis and the same for the Y axis. Am I crazy for trying to do it? Is the machine rigid enough for it and worth it? I don't want to sink all the money and work into it to find out it works as a sub-par CNC. I was to make some aluminum car parts with the setup, like brackets and mounts with it so tolerances don't need to be too crazy but I would still like some nice surface finishes and repeatedly results. Any input and advice would be really appreciated, thanks!