Its certainly doable, you just need to decide on where you want to start as a minimum viable product and tinker along as you go but ideally think far enough ahead about ideal situation so you don’t paint yourself into a corner and have to restart from scratch to get a certain outcome, although the Pi is pretty flexible for the power you’ll need.

I did this around 20 years ago (obviously not with a Pi back then) but as things changed I came round to the less hassle option of a phone and Bluetooth, particularly as I was often driving cars I couldn’t tinker with too much.

I had an implementation with a fold out 1 DIN touch screen which replaced the stereo and handled audio amplification etc and one with a stand alone hot plug 7" touchscreen. I had a reserve battery so that it stayed powered up for a short period of time after parking at home to do playlist and podcast synchronisation to my server in the house.

As other people have mentioned I was using Kodi and running audio from it as well as satnav etc. Mp3car was a good resource at the time.

There’s an up to date list here - my specific problem were Lloyds group ones as mentioned on that page.

The parking app is paybyphone which I’ve only used a handful of times. Ringo which I normally have to use seems to work fine.

I’ve been transitioning over the last week or so, on a new 8 pro,which is the same dimensions as the 4.5 year old Samsung it replaced.

So far, I have two banking apps from the same UK provider that don’t work due to them checking the same flags as Google Pay (12 other banking apps I have work fine), one parking payment app that doesn’t work and I’ve been told uber has started to be glitchy with their latest update.

The work around for all of those (apart from Google Pay) is use them via the web browser where they are fine.