Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Yes, you can build mega menus using Cohesion. Building mega menus requires advanced knowledge of jQuery in Acquia Cohesion and CSS.
Yes, the component link field supports both internal and external URLs.
Google maps may not be showing if you have not set a Google maps API key.
Yes, this is possible by creating a custom element.