The project is just a typical bread board project. use what ever techniques your comfortable with. I use a mix of soldering for the voltage and current collectors and use wire wrap to tie those collectors back to the Arduino. One mistake I made that cause re-work was a case that was to small... While you can built this to whatever size you can fit it into my large Anderson power poles determine the project case width. I also use #10 wire to go from the power poles to the current sensors. I would recommend moving down to a size #12. The #10 was difficult to bend to mate up with the current sensors.