20 or 30 years ago there was an original 1916 or thereabouts Henriot biplane with a Le Rhone rotary that would come in to the Watsonville CA airshow. Hearing that engine run up was like nothing else I have heard. I spoke to the pilot who said there was no throttle as such, just a kill switch that would shut down the ignition momentarily, giving the characteristic vroom-vroom of these engines. Very noticeable on landing approach.
Imagine the cost of building the from-scratch Oberursel in the film! The replica Wright engine for the 2003 attempt to fly a Wright Flyer cost over $100,000 to build and the rotary is far more complex. Yikes!