Jason Torchinsky
thinks it's a good idea.
I did a Google search on 'smart fortwo cutaway drawing' and found :
http://www.supplierbusiness.com/news/29762/suppliers-to-the-new-smart-forfour
Apparently the suspension is the same. I guess, worst case, you take the Smart unit body and cut it down into a subframe, or fab a subrame from scratch..
So what is the odd car in question? It would be interesting to stick one in the back of a VW Beetle.