Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Will deffo have the writeup done on standard coil refurb. Just building up a test circuit. My take on it is that the weak link is the PVC outer on the HT leads. The 'coils' themselves are extremely reliable. With age the PVC hardens really badly and the inner core fatigues. This happens even on low mileage bikes.
Its all a bit of a nightmare isnt it! You can see why people the world over recommend running standard ignition components, but equally its easy to understand why people are tempted by promises of (relatively) maintenance free ignition systems. Sounds to me like you've done your homework and in theory everything should be fine, but I guess this is all part and parcel of running an old four. Blood, sweat and tears! Oh and of course lots of money!