I can't even look at it properly at the moment, because I am compiling video codecs, and it takes an eternity. Maybe tomorrow I can have a look at it for you and see how easy it is to downgrade it from 1.3 to 1.0. A cursory look revealed 4 script differences so far - which isn't much. And it doesn't look too heavy on xmodels or image files, so it might not be very big in gamestate.
CaptainSlow (14th September 2015)