The top could be bought as a spare part but I can only find them for the P4 controller now
DJI Remote Controller Spare Parts Replacement Upper Shell for Phantom 3 Adv/Pro 4K Quadcopter $28.03 Free Shipping @GoodLuckBuy.com
No. And I don't really need them. I could right away tell there was a difference when I took the first pictures. And later on when I read the manual it was confirmed.
I also just upgraded from P3P to P4 and the P4 images is a bit sharper and the colors seem a little better so something not right.
However there is a lot more lens flares on the P4 images. Very annoying. What's up with that?