Any electrical engineers on here?

[EyLayo]

I'm wanting to reorganize/ update a switch panel on my boat. I've been doing the 'Tube diy research route so far. Things look fairly straightforward to this point, but I know wiring sometimes can be fouled up by 1 wrong wire. I plan on doing all the work. Wondering if someone in the know would be willing to answer a question or 3, or possibly check my work after complete? Let me know.