Its pretty much the same way that you add the fields to the single.php file in my tutorial located here: viewtopic.php?f=11&t=209
Some minor CSS changes will need to be made of course most of which will be located in the master.css file.
If you need more details let me know.
Eric is best known in the forum for his in depth tutorials. He started in design 4 years ago and then discovered WordPress and has been coding and hacking themes and plugins ever since. He's quite helpful if you have any questions for him in the forum. Eric also makes his own WordPress themes and plugins and provides ClassiPress consulting on the side. David Cowgill - (Owner of Classipress)