I had a look in the layout and presentation products of plone. BernArticle sounded interesting as it looks like it gives you a lot of flexibility for laying out your article. I installed it in the Products for my plone instance and then added the product to my tws site. All you have to do is unpack it to the Products directory and restart Zope and then go to "Site Setup" in your Plone site click on "Add/Remove Products" and then select "BernArticle .." from the "Products available for install" and click on Install.