Stream media over Wifi
Just a quick idea or note for those looking into installing a tablet and carpc. You can use your carpc as your media server...but you need to also make it a wifi hotspot. You can install VLC player, enable web interface on the carpc and then install the VLC Direct android app on your tablet(s) and stream the media from your carpc to the tablet using the VLC Direct player.
If you are just using tablets as I am you can simply use the wifi hotspot capability of your main tablet (if it has that capability) and connect the other tablets to it and stream using the same VLC Direct android app. Simple enough and works great for me.
VLC Direct Android App
Better yet...whether you are using LINUX or Windows as your carpc, just make your media folders shared (Samba/Windows Shares) then enable the hotspot on your tablet (if it has that capability) then do your streaming over your hotspot using the VLC Direct app as I mentioned above to the other tablet(s) in your car.