Love and remember this project -- as someone who has also been jamming customized PC computers into cars since the mid 90's, I really believe that there is still a lot of unrecognized potential in having the ability to carry your own personal data and applications with you. I used to have the top viewed install on the MP3Car forums back in the early 2000's when that site was kind of the central hub for these projects. Unfortunately at some point those archives went offline and and an overwhelming amount of information on hundreds of these projects were lost.
At that time you have to realize that some cars were shipping with tape decks and others were shipping with big screen nav systems that sucked. The objective was to replace that junk with a touchscreen PC, make it look like it was built that way, make it integrate with the car as much as possible, then make it do everything you could ever want to do in a car. My install had: automatic backup camera, in-dash dvd, timeshift recording for am/fm, xm satellite, and uhf/vhf tv, gps navigation, 4.1 audio, music/movie playback from hdd or usb, wifi hotspot, cell modem, integration with the car's accessory bus (steering wheel buttons/react to events), basically the works. I even eventually got my system fully working with LinuxBios (Via EPIA-M) which was fun, but not something I ever want to have to repeat.
I did eventually come to learn that trying to build and maintain a full telematics suite for a userbase of one was a foolish endeavor. Today I have a small Raspberry Pi running 24/7 as a headless NAS in my car though if I had the time I would probably like to upgrade it to a small proxmox hyperconverged cluster instead. My car goes mostly everywhere I go, and when it doesn't, I can fall back to VPN. If this sounds interesting to anyone else, I'd highly recommend giving it a try, though it's a lot easier to deal with the constant power requirement in an EV.