I've circled around electronic ignition a few times but eventually concluded it wasn't worth the bother. The standard Villiers magneto can be made very reliable with little drama and parts are readily available so why change?
Have you started on the carb yet? They are also remarkably simple and easy once you learn the Villiers way and realise everything you've learned about any other carb is just a handicap.
I went with the electronic ignition for my Cadet because it offered a 12v conversion as part of the system. I live near the Lake District and there are miles and miles of great little roads that just suit the cadets 35-45mph speed, none of them have street lights on and i do like to be out riding it in evenings after work, often getting carried away and returning home in the dark so having 12v lights was an essential for me, the ignition conversion seemed the ideal way to go about it, and it gives me the option of fitting indicators at a later date as its a bike that gets used a lot.
I got a manual from the National motorcycle museum on the carb, interesting reading.
At this moment in time i'm not sure if i'll keep the lever throttle or just use a normal throttle, i've never ridden a hand change before so the normal throttle might be better, i'll getting it running first then try it and decide.