Well, everything is in the title.
I've allways been fascinated by Car Wars, the way you can customize your car and the mad Max / postmodern scenario like escorting the big shot's truck on the motorway.
And so, i think that using lego - and a system close to MFZ -could just work perfectly.
Regarding car, there are plenty of microscale artists. A few ones
Regarding the system, the best things i remember are the JB007 and the StarWars D6 chases.
In both there is an auction mechanic that could be emulated by a dudo (perudo)-likehttps://en.wikipedia.org/wiki/Dudo
At least to establish the initiative at the begining of the turn and/or other advantages
The reste could be quite the same....