For a while, I had considered doing my micra up like a baby rally car.. Add some long flaps, make up some skid plates out of 1/4" thick aluminum plate. But after seeing how little it takes to damage the condensor, I reconsidered. But, you could armor that up easily. Toss on some nice OZ rims and some dual sport rubber and a bit more exhaust and you could have a good little car.
Micra has a disctinct advantage because the tires are out at the edges. Good angle of approach and departure.
Its certainly not impossible.
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View my fuel log 2015 Micra S automatic: 7.9 L/100 km ... 35.7 mpg (Imp) ... 12.6 km/L ... 29.7 mpg (US) ...