DIY box mod help needed!!

[Acaciastrain]

So this will be my first attempt at making DIY box mod. I'd like to run dual 18650 on it but I'm having trouble finding a few parts and need some help.
Firstly, this box will be a sub-ohm box So I won't be putting a chip or any kind of regulator in it.
What gauge pos/neg wires should I use if I'm building lower ohm set ups or does it matter?
I'm having trouble finding battery springs or spring plates that are decent. (not battery boxes just to clarify)
Also I'm going to get a 510 connector with a large whole for wider wire however does anyone know what I'd google to find a top cap for the mod? Like where the atomizer will actually sit like the top part on the picture below? (sorry for the horrible description.) Also on this mod below does anyone have any idea what kind of switch that is? I really like the style of it. I'm in a bind and any help would be greatly appreciated

 

[SingedVapor]

Bumping and watching this thread because I'm doing the same thing. hopefully somebody will see it and you'll find your answer


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[Visus]

Check out Jewks mod he just built maybe he will give ya the parts for building his mod he has everything your asking for and a very low drop in volts.. He says, "lower than any of his mechs.. If you can solder in that mosfet chatted about in the post your v-sag will be even less than his..

Unregulated mod and voltage drop question