Hello Paolo, thanks for replying and sorry for the late reply!
I’ve contacted the theme developer about the issue, but unfortunately the theme in question hasn’t been up-to-date since 2012. The developer was last active on the theme support some months ago, and I’m afraid he is now on a hiatus.
Personally the theme isn’t something I would have worked with, but it’s what the client specifically asks for. I would be more than happy to provide the theme code if you can direct me to the specific code sheets you’ll need.
Thanks for the help!