Been done before, buy John Dodd in the 1960's. It originaly had a Rolls Royce radiator and emblem on the front, but Rolls sued (as a child I remember the court case made national news) and he had to remove it.

The Beast

With Rolls Royce front

It is road worthy (presently in Spain),  and he uses it for fun as it does about 1 km per litre of fuel, and the noise is "marginally legal"

Admittedly the paint job on the video example is a little better.

Just found this, someone has put one into a Rover SD1

Rover

YouTube, "John Dodd's Beast" and you will find a couple videos.
Matt