Wow, you're very ambitious!
AFAIK, it was very difficult to get Symbian and the S60 UI to scale well to high resolutions. That's why the Nokia 808 PureView, with a 41MP camera, only had a 0.2MP display!
Also, AFAIK, Symbian was very difficult to port to new chipsets (known as a baseport in Symbian language). I don't know the details, but that's one reason why manufacturers started to leave Symbian and move to Android.
However, it would still be great to see another Symbian phone... come on HMD!
Try Sailfish OS.