Okh, nice attempt! [;)]

If you want the price to appear in the Price column, you must set a default currency at the end of the file [font=courier new]com/eteks/sweethome3d/io/DefaultUserPreferences.properties[/font] found in the [font=courier new]SweetHome3D.jar[/font] ZIP file (installed in [font=courier new]lib[/font] subfolder of Sweet Home 3D installation folder). This change will let you view the columns in relation with prices (price, VAT %, VAT, price VAT included).

Pay attention that the values you can use in [font=courier new]<furnitureVisibleProperty name='...'>[/font] are the values available in HomePieceOfFurniture.SortableProperty which are different from the ones in DefaultFurnitureCatalog.PropertyKey.