2 coils you will have a total of 4 wires and 3 coils a total of 6. Yes all positive wires can touch, same with negative. I like to space the coils just barely at first until the wire oxidizes. Then they can touch without a problem but there is enough space that you can position them without touching.And here I am still trying to seat one properly! (albeit vertically) My problem with all these trickier build is if something is a tad off I just put up with it because I don't want to rebuild.... again.
So for the 2 or 3 coil design, do you end up with 4 or 6 leads running through the grommet/pin assembly? That sounds tricky to do, if the positive leads are touching each other, is this ok? or negative for that matter. What are the spacing requirements if any?