I was finally able to get the Ical Feed to work in my application; however I am now trying to figure out how to only show free/busy details on the Google calendar (if the user is not logged into that Google Account)

For primary Google calendars, you can maintain this under the "Share this calendar" setting  - "Share only my free/busy information (Hide details)", but I don't know how to do this or if this is even possible.

The purpose for this is for a reservation calendar.  I want the user of the Google calendar to be able to see the details of the event (created by the feed) but also be able to publish this calendar on an external facing websites so that users can see "free/busy" information.