Looks fantastic. What is that exact model head unit?
How much butchering of the console is needed?
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It's this Android 10 Car Radio Multimedia Player NAVI For Land Rover Discovery 3 LR3 L319 2004~2009 Stereo GPS Navigation AudioWifi OBD2|Car Multimedia Player| - AliExpress
Plus this carplay| | - AliExpress
Plus a camera & USB sockets.
The audio from the screen goes into the AUX input of the factory head unit.
Just running Apple CarPlay & Android Auto, there hasn't been any slowness from that unit.
Maybe if you want to run more demanding apps the bigger RAM & more processors will be needed, I don't know.
64g will hold a lot of MP3s.