I recently took these side by side pictures of Allison and Rolls engines. The model engine seems to be more similar to the Allison engine than the Rolls engine.
None the less it is a spectacular working model of the engine.
That is incredible, It amazes me what people can build.
There is a local guy here that always has his remote control cars at a car show, one is a v-8, the other is a V-10. they are about 1-6 or so scale. they are very cool, and sound alot like a full size engine.