Slide in windows

How easy is to be able to slide in a contact us form, if a user clicks on a button down the right hand side?

Do you mean like this one? http://bustosmartialarts.com/

I just made this available in the Online Components Library. Just search for Pop Out Tab. Follow the instructions to edit the CSS to change the content. It uses the Roboto font, but you can easily change it to any font you want by editing the font family rule.