I have a Google Map with filterable markers and info-boxes containing simple information about each marker( when you click them ), but was wondering if this is possible:
When you would click on a marker - instead of a default info-box a big div appears on top of the map with tabs which shows all the possible data I will provide about a marker via JSON ( images, links, pictures ).
How would you approach about implementing this functionality?

In your loop to add markers, add something like this:
In your code you need to determine the map size and put a translucent DIV over top, then show your own HTML absolutely-positioned DIV inside the map's weapping element.