Good morning, darkangle. Sorry I couldn't put this in my PM to you.
Here's the diagram you sent to me. I've cleaned it up, removing extraneous wiring and devices that you won't need. It's very simple, just like that basic diagram I originally provided but using the ignition switch you have. When you get those directional lights, and hopefully they will come with their own diagram, let me know and we'll go from there.
Your original diagram was for a 6volt system but that doesn't change anything. It's still a simple DC circuit, voltage doesn't matter.
Your head light will have three wires. One is the ground, the other two are the high and low beam. You'll need to select one, either high or low and wire it as per the diagram. Insulate the other or cut it off. It won't be used. I'd select the high beam for the brightest light but it will also draw more power from your battery.
Hope this helps.
Tom