I wanted to make a simple KDE Widget that would parse raw HTML. I do not believe that there is an existing DataEngine to do so, so I would have to make my own. How do I package the Widget and the DataEngine together when the user goes to install. Any help or advice is appreciated.

I'm not sure if it is possible to create combined packages - at least Techbase does not give any indication as to how to do this. I would suggest sending an email to plasma-devel@kde.org to see if the developers have any suggestions here.