My prototype circuit

can anyone tell me if this will work? I don have a breadboard for testing yet so can only do it in theory
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yes it is double barrel, yes it has 2 switches. will it work if wired like this?

 

So one switch controls the voltage display (both would need to be pressed for it to work) and the other is your basic on/off. Looks fine to me...

 

breadboards arent good at amps.
not even sure what you could use one for with that circuit. its more of a block diagram..concept is fine.

solder wires to stuff..

 

thats pretty much how things work out for me. was planning on making one a momentary switch for activation and a slider switch for the display so only switch it on when adjusting voltage.

 

And here is the double to single barrel adapter I just whipped up will probably make a wider version for tank mods
Will still need to go too electroplaters for a nice safe finish since its aluminium and don't want to be inhaling corosive salts