The current code is very clean and easy to read, but it will get messier once more than one person is involved.

As such, I propose we adopt the WordPress Coding standards, so that everyone is on the same page.

This doesn't mean that you would have to go and add extra spaces around every function calls etc. just that this should be the formatting of new code added.

I think cleaning up one file at a time, as it's being worked on, is a good way to go about it. I say one file because the spaces have to be converted to tabs and it's not good to have both types of indentation in the same file.