The main thing I don’t see on that site (although they must know it, so perhaps I’m just not seeing it) is what the various pins are for. For a Fritzing part we need to know what the wires on the connector do to know what to connect it to. We also need the dimensions of the part to make a breadboard image for it. A quick glance at the parts in the tank.fzz file indicates the motors have power, two control signals or motor connections (as they appear to be connected to a motor driver in the sketch, in which case I don’t understand the purpose of the 9V and ground pins.) plus two possibly unconnected pins (since they don’t appear to have connections.) This is the kind of information needed to make parts. I’ve made Lego like motor parts, see for instance
which uses the Yahboom Lego compatible motors and a Super:bit driver board for the Micro:bit (and which are a lot cheaper than the Lego prices I saw 
) The motors available in the tank.fzz should do for most of the motors (to Fritzing a motor is a motor most of the time.) Are there other things that you want parts for?
Peter