With the openings completed you will now be able to modify the original facia which will be used to provide support and allow assemble of the new panel. The idea is that the new CF facia will be sandwiched in between the leading edge of the bezel and the original facia. This is what holds the new CF facia in place, provides for stock mounting fasteners to be used , and allows you to use the bezel which gives the new panel the "look" because of the outline it creates around the CF panel.
Lay the CF facia on a bench and place the stock facia on top of that. Then you will see where you need to cut the stock facia to allow the gauges etc. to protrude through. You can cut the stock facia with a cutoff tool and then file to make it look neater and get rid of sharp edges you might get cut on or that might nick a wire. Be sure to leave vertical supports, do not cut out everything but the outside edge.
