I've seen (I think) one done with the front of a mini. I thought about it too, I was going to attach it to the garden wall, scatter a few bricks etc, make it look like it crashed through, also wire up the lights. I was vetoed by she who knows best.
Plenty of info out there. Have a search with Google (other search engines available, see internet for details).
Guy on Retro Rides recently "converted" a K10 Micra.