Google Map List View InfoWindow

I have used the guide at the link below to setup a list in SharePoint to pin locations on a Google Map.

http://www.incworx.com/diy-custom-sharepoint-series

I am now trying to implement InfoBoxes so that when you click on the pin it brings up information about the location (pulling info from the list) in a InfoWindow. Then if you want to view additional details you can click on Read More and the list item will open.

Anyone have experience of InfoWindows?

Thanks