Hi Rich,
What I want to do is to power the spitfire with the electric motor. Then install the electronic sound generator and speakers. This company makes the sound generator and have many different sounds.
http://www.benedini.de/Home_E/home_e.html
I would be interested to see the setup you describe.
No I don't have a real V12 engine, But i do have a real 4 cylinder inline engine (50cc). it sound very realistic at 2500-3000 rpm but as I said it will just fly the model at that speed.