What I have so far

Hardware

Car stereo fully installed
Tablet holder installed
Wiring harness with accessory power and can bus wired in (currently going to the glovebox)
First prototype of the gateway box with the esp, mcp2515 relays and the orange pi working
Rear view camera installed (a little janky but it is working though)

Tablet launcher app with some favorite and planned destinations, media controls and rearview camera
Esp8266 firmware reading steering wheel controls and with a log mode to assist with reverse engineering
Orange pi server reading serial commands from the esp, sending keyevents to the tablet via adb and rearview camera stream using webrtc
Cloud server integrated with here maps places api for searching places, saving next destinations and integrating it to the tablet frontend to list and launch directions

Tidy up glovebox wiring and fixing the care gateway box
Fix rearview camera properly
Reverse engineer can b for current gear, open doors and lights
Start planning how to get into the can c network (engine control) to get OBDII data (currently I'm on the can b which is the low speed, non critical bus)
Figure out a way to turn on the radio whe the car is turned on (acc power does not turn on the radio)

Implement opening rearview camera when shifted to reverse
Create car status component showing doors and light state (just for show because it is nice 😅)
Play music when car is key is in the ignition, stop the music when leaving the car
Fix shutdown timing
Figure out a way to postpone shutdown for when the car is parked but not for so long
Start playing with OBDII protocol (maybe using those cheap OBDII dongles)