I built safety circuits including fuses, MOV's and Zeners. To be prepared for anything. That all was such an added pain in the ass, especially since the drivers do these safety functions also.
In retrospect, given that the drivers have circuit protection, I won't be doing the fuses, MOVs and Zeners again. I learned things, and that's always a good thing, but easily 50% of my time was dealing with these elements as wells as that damned box. Next time I use a metal base (platform) for attaching the drivers and the handy terminal blocks and maybe cover the blocks. Otherwise I'll leave open, with no sides and lid to the box.