The portlet contents / icon would be replaced with the custom maintenance message.
The location of the portlet in the carousel would remain unchanged.
The portlet would remain 'clickable'.
For the `context-nav-menu` WC
The portlet's flyout/context menu contents would be replaced with the custom maintenance message
The portlet menu item would stay in the same menu location
The flyout/context area would not be clickable - current nav menu design is the click-ability of the context menu happens from the html in a portlet-parameter config. Overriding that config with the custom maintenance message would lose the links