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I bought the same load center box as used in this instructable, but it was too small for what I wanted to do. I wanted to use a 250v 30 amp breaker as my master on/off switch. I had to trash the box I started with because I did not have enough space for the components. I bought the Eaton BR24L125SGP load center. It has worked out quite well and I had an easier time locating all the components with room to spare.
16 ga stranded wire minimum. 14 ga would be better. Don't get too large and don't wrap bare stranded wire around PID terminals.