That sounds a cool idea (and VERY unique). You should see if you could get a VAG 1.4 TDI (think VW Polo) engine in the front. You'd probs get about 60 MPG combined cycle in a mini (half the weight of a polo so better in town but worse on motorway due to inferior aero)
I like the idea of a VAG engine! Those things seem to go forever.
Just spent the last few hours doing some research and it really does make me wonder why we aren't all driving diesel cars???!! The advantages of a modern diesel engined car for everyday use seem to far outweigh this disadvantages, especially with the newer turbo diesels with variable vane turbos.
Starting to like this idea now guys, at first it was just a curious question but thinking abut it, the amount of torque from a diesel in such a light car will be really really good fun, and it should be able to get to the moon on a tank of fuel and wont break down!