What's the point?

Apart from the engineering involved which is obviously very cool, where's the purpose?

Doesn't make it any quicker up the 1/4, chassis balance will be all over the shop, so would make a terrible track car, and for the road, it's entirely pointless.

Suppose it depends what you build your car for. Do you build it to enjoy it on the road/track, or do you build it to park up at a show so people can go "oooh, that bloke put two engines in his car"?