Help with Dual Atty Box Mod

[PDDesign]

Before I start I realize this is a wonky idea. Nonetheless I'd like to build it just to build it. At worst I'll have parts to reuse for a less complex mod.

Right now I am just getting ideas together. The central idea is to have two 18500 batteries run separately to two clearomizers whose output vape is joined into one tube then going to a single drip tip.

Below is what I have so far but I know I will need fuses and possibly some regulation chips and/or a fet to get the switch at a safe Amp rating.

The design starting from the batteries:

1. Two Efest 18500 IMR 15A batteries
2. Both Batteries run to their own switches (unknown Amp rating) (preferably the small slide kind)
3. POS & NEG from each switch runs to a single DPST switch (unknown Amp rating) (preferably a button style)
4. POS & NEG from DPST switch goes to two clearomizer connectors & tanks.
5. Tubing from top of clearomizer tanks goes to an air control valve (so one tanks air flow can be removed from the air flow if it is not in use).
6. Air flow control valve goes to driptip.

I'd love input on everything but specifically I am trying to figure out the switches and possibly regulation. I would like to run the attys at 1.2 - 1.5 Ohm. I'm fine running a regulation or VV chip if that will allow me to get the switch into safe amp range. I have never used a DPST but I assume the amp rating is for both poles i.e. a 10A DPST can handle 10A on both poles, not 5A each. I am pretty sure I would want my fuses between each SPST switch and battery but I am not sure of the amp rating.

Below is a diagram of the idea so far:

 

[p7willm]

You need to decide if you are going to have electronics or not.

If you have electronics the amp rating of the switch does not matter.

If you do not use electronics then you need to decide how low you will go with the attys. If you keep it above .84 ohms then you will only draw 5 amps.