That is a good looking engine, what are the specs? and from where the plans.
You may not need 10 cdi units.
You need a system that will have 5 coils, and use waiste spark. 2 sensors, one on the crank for timing and one on camshaft to start fire at cylinder #1 and then divide ...etc.
Rob, Charlie, John and the other guys may know how to do that....I dont, I just have the idea.

Thank You
A