Feature
Description of the feature
Percentage
Items/Objects
25 objects, more or less

Metadata
Some useful source info/subject and tagging

Exhibit
Min. of one, well structured exhibit.

Exhibit Content
Should give background context, interpretation, or analysis. (Say something useful about the item.

Exhibit Organization
Should use several sub-pages.

Purpose
There should be an overall purpose that is clear; and you should write at least a few sentences about this in an "About" page.

Collection
At least one collection; maybe more, as the type and logic of your items dictates.