Suspect it is why they gave you an SD card slot. I have over 100 albums on one now and can select by album, artist, or song. Of course I can take the whole tablet or just the SD card with me in other cars. (Actually got started with the unit my RV several years ago but that was not removable).
When you look at the depth required by the player compared to a modern tablet it becomes obvious that there is a lot of mechanical wastage.
Of course the way CJF did it was kinda dumb. I have a little USB CD/DVD
that was under $30 and sits on the bottom of the cubby under the 12v outlet with the door closed. Of course my Tablet knows how to talk to it.
Still think the NG audio will just be an amp, speakers, and antenna. And choice of locking docks.