That is pretty well made. I would recommend Thomas Benedini for a sound card (TBS mini). Perhaps a Clark board - But wiring either up will be a major project / issue as you are dealing with non standard electronics. I would have thought the model had some kind of sound card with it - the four speakers aren't connected to anything? What is in the triangular shaped alum box? I would think the motor/ speed controller it looks like.
The last two photos look like some kind of blank firing device. Very cool! Any indication of the type of blank used?
Nice model.
Bob