Reply to "how much work do you think this would be?"

The guys are right, just get the best example you can find, unless you really enjoy working on it or you have tons of money. Especially a 5S, call a few vendors like Wilkinson and you will see the flares alone are close to $30K if you can even find them anymore, then you have the metal work, entire car rebuild, etc. But the end result is you have a car the way you want it. If I was you, and you want a modified body, just buy the best high HP stock body show car you can find, with great interior, etc, then have someone do the 5S package and repaint. You will still be over $100K, but at least you have the final look you want, rather than sky rocket price to do the whole thing. Look at that white car again and really add it all up, parts and labor. Discussions over a few thousand on purchasing that car for $12K or even $5K is a miniscule issue compared to the cost of bringing that car into a nice 5S. Buy the best you can find, then convert it.