[HELP] RPI car power circuit

Hi everyone, much love from Italy!
So as you have read in the title, i am trying to build a Car Headunit power circuit for a Raspberry PI 5 in this case.

I have implemented some protections (not sure if they are any good, since i am a novice in this…) and most of the parts are AEC-Q100/101.
As you can see in the schematics there are 2 separate circuits, one for power (the one on the top) and one for shorting the J2 pins on the Raspberry when the ACC line changes state, so that i can safely turn on and off the raspberry without ever cutting power.

Every part is documented online, except for the DC/DC converter (Tobsun EA50-5V).
I found some other solutions like the TI LM61480-Q1, but it would require me to create and print a PCB, which I am not sure i would be able to do myself…

If you guys have any suggestions I am open to them! I really want to learn something here, and also build a project that does not explode and destroy my BMW E30, while being extremely reliable for long term use.

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