If you use the Zen theme, then you should also
be using the Zenophile module!
The Zenophile module allows you to very quickly create Zen subthemes from within
your web browser, as well as editing options such as the site directory where it
should be placed, the layout type (fixed or fluid), page wrapper and sidebar
widths, and the placement of the sidebars.
I'm an Acquia-certified Drupal Triple Expert with 17 years of experience, an open-source software maintainer and Drupal core contributor, public speaker, live streamer, and host of the Beyond Blocks podcast.