I know you're joking, but there are companies that build custom stuff like this to spec for customers (Hummers, etc.) It raises an interesting question as to how the rules of our club are interpreted. All the modifications are consistent with the time period in which the car was originally manufactured, so it's possible that it could be considered a "stock" coach, if that is the way it was delivered to the original client.
For instance, here are a couple with the same type of work that were built from scratch:
http://www.pinkhummerlimo.co.uk/fleet/triple-axle-hummer.html
http://big-limos.com/custom-limos-gallery/stretch-limos/hummer-stretch-limos/