Listen to your DAD. He is not as ignorant as you may believe. You are riding and getting around. You are just 17.
Wait til you are a little more mature and then try a project that is not your primary source of transportation.
If you try this project, you will kick yourself in the behind a 100 times when you want to go somewhere (a date maybe) and the Saturn is in pieces and no $$$ to buy expensive parts.
Been there, done that. It was a long time ago but still remember it like it was last week.