Nice looking, good job! Like you, I'd be worried about the high-amperage cables going through the metal wall. The hoses on the cables are good, but look like there is still room for chafing. I'd also be looking for rubber or plastic grommets to fit inside the diameter of the metal hole, so that any rubbing is rubber to rubber/plastic, and not metal to anything. I've also used electrical tape around the hose, to build it up at the point of entry, then pulled tight so the pass-through point has no motion whatsoever. But then again, I can be pretty anal about this stuff, and the electrical tape "solution" doesn't look very good!
As it is, it should last about ten years! LOL
Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan