OK, Electronic skills for myself go like this; 
I can solder well and know a good join
I understand how some of those components work
I understand the idea of the  potentiometer 
The jaycar one - 30 buck no problem, as long as I have a guide to build it - no worries. The switch - same deal...  
So will the 10A one do the job and if I go build it... could you or someone you know assist in knowing which 4 wires to connect to it and the switch? Thats about the only missing part of the puzzle for me. 
Think I got enough of an understanding to do it? 



When I went looking for the resistor pack - I was expecting a circuit like pictured below, but perhaps older parts. This round thing with wires connected is very old school to me 

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