I mounted each string on a section of plastic chopping board, with the leads soldered together on the opposite side, and a 10M bleeder resistor across each capacitor to hopefully forestall any nasty high-energy-discharge-to-finger-based surprises.

I used ring terminals to attach the ends of each string to 1/4" brass bolts fitted into the chopping board. I used relatively heavy stranded cable for connecting the strings and other parts of the primary circuit together, and passed it through flexible vinyl tubing to increase its insulation (probably less of an issue if you should happen to consider your wiring layout more carefully than I did)