Hi Agustin,
Theorically, theme-selva should work. However it needs some CSS work.
Theme-zen uses a different layout, based on DIV instead of tables. The new layouts are set for all portals on upgrade only if you run the /theme-zen/admin script. Otherwise, Zen will use the table based layout and Selva will still work.
If you run the upgrade script to replace the layout to the DIV based one, you'll need to add some styles in the Selva CSS for the 1, 2 and 3 columns layouts (see theme-zen/www/resources/css).
