Do you need a CNC to make this project? No, so don't let that keep you from making your own router table top! You can draw the area of where your router will mount using your router plate onto the material you use. Then free hand using your router to cut out the recessed area. It doesn't need to be perfect, close will work. You do need to make the screw holes perfect so use your existing router base plate to mark the holes. Use a hand drill or a drill press if you have one.
Table Saw: Ridgid R4512
Router: Ridgid R2200
CNC: Shapeoko XXL
Note: I would recommend you make your router table top out of cabinet grade birch plywood. MDF is okay but may not stay flat over time.