Just thought it would be usefull to remind all that.

• It's possible to override any image in web application without overriding default ones
• It's possible to override any template without overriding default ones
• It's possible to override any module, class etc.
• If you are not sure which template is used enable debug output
• If you change templates and nothing changes disable cache
• You can write your own extensions
• We are using foundation css framework http://foundation.zurb.com/, at the moment we are using 3 version. using 4 version.

Each time you are modifying original files you are losing upgrade capabilities. Live Helper Chat is very flexible and allows to change almoust everything without changing kernel. 

If you have any question use google group or just leave a comment :)