I'd weigh it w/o the plastic bag for a true weight. Replace the mounting screws with aluminum ones. Try to notch the supporting internal fins. Drill a few lightening holes along the perimeter. Should then be able to get to factory weight or a little less. The factory strikers are made for heavy duty use and service life. You've probably lightened the door and with some due diligence you probably won't slam the door(s) shut. Billet steel can take a fair amount of structural lightening. Its stronger metallurgically than the factory steel. I'd say, "Treat it like and early A/FX'er". Experiment on the passenger side first since it gets the least use.