It starts to look like a car. Decided to follow the all metal train track which has been well documented @Fabian_Schurig and @bcrazycramer . Still waiting for some parts like the central diff (backorder at HobbyKing) and some bearings.
The X4R receiver might be some overkill but was a no-brainer having a Taranis transmitter already.
Main question is what to do with tires (and rims). Any advice on self printing or buying ready ones?