Vag coils

Hello,

I'm planning to build harness for my project. just wondering about the wiring of the coils and injectors.

In my project i will use 6 Vag coils which requires 4 wires for each one. Signal, power and 2 ground.

the question is when prepare the wires should i use the cylinder head ground from the beiging of the twist? Or starts the twist with 2 wires which is signal and power and once i get close to the coils i will start to add the ground which going to the head cylinder? what do you recommend in my case.

and very confused what would be for my core. the Cam sync and crank positions they have 3 wires for each so im little bit wondering what the best start point would be...

thanks,