That's pretty amazing your parents let you do that when you were just 4 years old.I had an 2003 Corolla that was used for transporting lab samples to hospitals. I was only about 4 years old when I bought it with 205,000 miles. It was white and I put a rear spoiler, factory used mag wheels, and had the hood and bumper cover repainted due to road chips. The car was like new when I sold it with 215,000 miles on the clock. I really liked that car and after I sold it I wished I would have kept it because it was such a low priced dependable car that looked like new. My resurrection was very similar to the OP's. Nice work!
The deck is a Sony XAV-AX150 - a simple, almost rudimentary digital media radio. No optical drive or aux/HDMI input/output. There is a basic AM/FM tuner. It does CarPlay and Android Auto - and frankly for the price($250 at the time, it’s now $300 at Crutchfield), it’s a step above Chinese Android and 3rd tier brands(Boss/Jensen/Planet Audio) for sound quality. The UX is simple and intuitive, it doesn’t have the polish of Pioneer, easier to navigate than JVC/Kenwood or Alpine.New radio turned out great! Any details on the installation?