It would entail a whole new front suspension. The original design is based on the 50's Humber Hawk and there is no facility for drive shafts, hub carriers etc. Anyway, it would roll very easily off road. The front axle width is very narrow, about 14 inches in from the bodywork/wheelarches each side. This is why it handles like a Reliant 3 wheeler.
BTW, did a massive powerslide round a traffic island yesterday, with armfuls of opp lock, holding it out on the gas. There were some cyclists pissing themselves! Not sure if it was fright or laughter.