Of course, I think RC CDI and RC Coil would work, but my experiment is to try something that is different. By using coil from small commercial gas vehicle or house hold equipment open the chance to find easy and cheaper. Coils that my friend are using for this experiment costs only a few bucks per each. If we can find one that match then everybody can make his own ignition system for only about 20 bucks.
Here is the other one red coil that I think it gives the best performance and best match. Although it looks bigger than the last black one but its weight is only 50 gram more.