That wont work. Theres nothing maintaining piston cylinder alignment. pistons and cylinders cross the centers of the rotating crank hubs so the power take off could only be the outer or side face(s). Cute cartoon though.
They have a functioning propane model on that site, but it didn't power anything, just ran. The alignment of pistons was controlled by the gears they were attached to. It looked like all the round portions of the engine were actually gears.