18650 series/parallel build

I've been trying to look at various charts to determine appropriate coil builds and wattage settings. So far I'm only confused by it so hopefully someone can help straighten me out. Many voltage/ohm charts are like this one linked off Phil Busardo's site...

Hello friends. I'm new around here and not really sure where to post this but can someone bless me with a parts list and/or diagram for a DIY dual 18650 series/parallel build? Specifically what DPDT switch is best for this application. I've searched the interweb only to find vague information...