Massive Parallel Lithium Lead Wire Connection Point
It depends on the discharge rate. I'm assuming that your paralleling them for a quick discharge. Regardless, your going to have to calculate the max discharge rate and current which is dependent on the load. The terminals can only handle so much current, otherwise there will be ohmic heating and destruction of the terminals. 

You could attach a parallel cable at multiple points along the bank, the terminals all going to be near same potential anyway. Or since your so good at wielding spot wield another strip of metal along the top of all the terminals that will be sufficient for the 'current' requirements of the bank.

You have a nice bomb waiting to go off, handle with care.