Sad to hear about your dad, dude! Looks like he'd built himself a beautiful car (or a whole garage of them), shame he's not here to continue to enjoy it...
To answer your question, the Dayz edition is mostly just styling mods as far as my research goes. The front bar is the first give-away, mine has the standard bar as per the attached pic.
Auto headlights are on mine too, and I think they're standard across the range as well (or at least across the higher-spec ones we'll ever receive in Australia). Have a look at the Buyer's Guide, it should give you a decent idea of what options most Stageas have - unfortunately I haven't had a chance to update it for a while.