Is there any Bootstrap customization guideline?

Authors must ensure that their items meet some guidelines regarding Bootstrap customization.

• The theme must have a unique design so that it can be differentiated from the original Bootstrap design.
• All default Bootstrap elements are required.
• Item must use the latest stable release version of Bootstrap. Item cannot use work-in-progress or release candidate versions.
• Item must follow Bootstrap's conventions for fundamental HTML elements and use the grid system.
• Item must use and restyle Bootstrap's components and JavaScript plugins.
• Item should not implement custom components or JavaScript plugins that duplicate functionality provided by Bootstrap.
• Item must not include pages based on Bootstrap's example templates without sufficient modification.