In general, I prefer to put things in the same file unless they are going to be reusable, in which case it's better to stick them in a module. Instead of splitting things into different scripts for maintainability, try taking the parts you would put in a different file and instead just stick them in different subs. I find it pretty easy to navigate around code that's logically split up and separates the big chunks into functions that can be pored over if needed, but can just as easily be skipped without any loss of continuity.