As far as I can tell you are putting a lot of html including complex css classes and even php in the body texts of most of the demo content. Do you honestly expect end user to be able to do this too?
I would not even give them the privilege to use full html let alone php text format. Just as you don't let people do that on this site (at least not for this message)
How can you make content look good without having to use so much HTML?
What is the best way to work with this template?