To Sum Up:
1. I want to make a massive change to the detail page. What is the best way to do without touching the core files?
2. Also unable to find where can I setup the google map zoom from the sidebar.
3. How to remove the sticky map when hover down on detail page
4. Edit the ADD A Listing page layout without touching the core files. e.g. change the order of the fields, etc.
Thanks a lot for you valuable time.