Yes, you have the speedlight off camera and reflect-bounce it through the film.
The LED light sources have a terrible colour temperature (They are blue LEDs doped to give off an approximation of white light, you would be better off with an RGB array of LEDs). The speedlight will have the perfect colour temp, allow faster you to stop the lens down a bit which makes achieving focus easier and the light is consistent frame to frame.
For the film gate, the perfs on the film are the same spacing as 35mm photography film. You can take an old 35mm camera, remove the lens assembly and the backing plate and you will have a plate that will keep the film nice and flat and sprockets to align the film.