Ferrari California - radio unit and speakers upgrade

Hello guys

I've got a Ferrari California with stock radio and would like to upgrade audio system but there is two ways connected with radio unit:

First way : buy a chinese headunit designed specially for California - i've got a sad and painful experience with this kind of multimedia unit in the other car (Maserati GranTurismo '11) so i'm not sure this solution.
Second: buy a Kenwood, Pioneer or any other company universal 2DIN Unit. But what would I do with space on the left and right side of screen? Is there any fitting cover to buy or will i have to make it custom? What with steering wheel control - should i buy Maserati Can to Can converter? It will work?

And second question about speakers - would replace it, i found this thread :
https://www.ferrarichat.com/forum/threads/upgrading-the-ferrari-california-t-sound-system-with-aftermarket-components.600891/
Could somebody tell me that the speakers diameter is fitting? I didn't remove cover yet and i'm not sure about that.

Thank u guys!

 

There are a few older threads on this subject that you can search for, but I think you’ll find that there won’t be a lot of input from California owners about sound system upgrades for the simple reason that most of them don’t listen to it all that much, so all the effort involved just wouldn’t be worth the trouble.

 

Scuderia Audio (www.scuderiaaudio.com) has a front speakers upgrade kit, a rear speakers upgrade kit and a full upgrade kit for the California.

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Does anybody have any experience with these, either the sound or the installation process?