Nice review!
I'm not sure about the corally plugs, they seem to be similar to the gold plugs which are often used here in Germany to connect batteries and motors.
They are sold from really small (2mm) to really big (5.5mm) which are good for 200A.
Not sure if the link is ok, but you could get a nice overview:
http://www.bk-electronics.com/catalo...ds=goldstecker