1. Do all maps official and unofficial come with roughly the same size which is approx 100cm x 70cm ? Always double-pieced like the Formula D Monaco track?
All of the official Formula D maps are the same size and double-pieced like the Monaco track. I can fit three boards (so six tracks) in the original box with all of the other game bits.
The Formula Dé tracks are not the same size and don't fit in the Formula D box (but work fine with Formula D).