I would consider mounting the PC and interface where the old Hurco boards were. If you plan to keep the arm mounted control panel you would then need mouse, keyboard, and display cables long enough to run from the panel back to the cabinet. Or you could mount the computer and display all in the front control panel and than just run a long enough cable back to the hardware interface. What that hardware cable interface cable is will depend on which hardware you chose. You will also need to consider how much if any of the physical control buttons you would like to have on your front panel. Also consider if you want a jog wheel here or umbilical to a hand pendant.