I was thinking about adding a decal to the top of my P3 when it arrives any day now.
Just need to know how much room there is to pick the right size.
There shouldn't be any problem adding a decal right?

I would not go much over 4" inches (101mm). Don't forget it is domed shaped so it might not fit correctly.

Make sure that the ink used for the decal doesn't contain any metal particles or you'll block the gps signal. Find another location other than the top.

Well I really want a full skin, but I know I would not get it on right. lol

l think any of the full skins sold for the P2 would fit. l got one for my P2 and it was surprisingly easy to apply.
They look great and are well fitted and cut, but on the P2 at least each of the gaps along the sides covers 2 fins of the vent-holes.