Mach2, I do not have a picture of the diode soldered in series to the wire going to the CDi. But it is simple what I do. I use a twin switch - 1 for Rx and the other for CDi. The switch wire going to the Cdi is spliced and a diode added in series. I cover the diode and the soldered joints by heat shrink.

I use Life batts. i.e 6.6V and so the reduction of 0.9V is enough to make the Cdi happy at 5.7V.

For the optokill I use the RcEXL optokill costing usd 10 landed.

For more details you may search this thread for "1N4007" and you will get more details.

The whole thing is very simple and less prone to trouble. I am using this in 8 of my gassers.