Well Rocket is just a little old fashioned. I'm still
vaping a single barrel big battery flashlight mod with regular resistance attys or D-1 cartos. When I really really need a hit I spice up to NIC level a little or fire up one of the double barrel flashlights. I haven't yet made a juicebox, just carry a little extra juice with me. If I'm at home 3 or 4 loaded mods is enough, same at work. When in the car there is usually at least one spare locked and loaded, ready to vape.
From my point of view Low Resistance attys, or High Voltage mods (or heavens to Betsy not both LR and HV at the same time) are hard on components, subject to higher failure rates, and are just a tad riskier than a single big 3.7 volt 18650. A pair of cartos loaded with 24mg/ml Redbull on a double barrel 3.7 volt flashlight is more than enough for me. As I vape the cartos I top them off with 12mg/ml juice and come down a little. For normal days (when the step son isn't around) a single carto takes care of things.
I'll watch you guys build stack battery, juice flushing mods, stick my nose in and comment (especially on a safety issue), but it's not really my cup-o-tea. Just do it safely, and have fun. Nothing is more fun than
vaping off your own creation.
Rocket