You are doing a great job on your project. You seem like a handy guy who is not afraid of adventure. You can delete your navigation and bring your stereo system up to 2018 standards. If you save the parts you will make money on the deal. The hard work has been done for you. When you are done you can add the Double DIN navigation/stereo system of your choice. Here is the linkI also bought some $10 Gen 2/3 GPS update DVDs off eBay. The first did not work. They sent me another, it did not work either. They sent me a refund.
Pre-03 nav delete how-to