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Its cool on my end. No worries. :cool:

Suit yourself, no matter how wrong you may be. But wasted (lost as you say) spark systems use a coil without one end of the high voltage grounded. Rather, both plugs complete the circuit. Feel free to google it. Cheers. :D

The engine looks great. You will however need to implement a distributor of some sort. One single ended coil feeding two plugs wont work as the electricity will follow the path of least resistance and only fire the plug not under compression. Alternately look into a motorcycle coil with two high...

It is missing the Z. Z is always to and from the cutting tool. A horizontal is rotated about the X axis, therefore the knee becomes the y and the missing cross feed on this machine is the Z. :p (not trying to be a know-it-all!, it is a very common mistake)

Could make do as a small horizontal mill. Albeit with only two axis. Although no Z isn't the end of the world if you want to cut slots and such. Perhaps you can fit a leadscrew of sorts where the stop lives now.

You could still use the cantilevered shaft, except make it hollow and have a release rod running through. The release rod pushes outward on a spring loaded plate (on the driven side of the clutch preferably to eliminate idle drag) to disengage the clutch.