I know this reply is a bit late, over 2 years late, but I just wanted to add to idevice Recycle that the way "they" designed this phone is exactly as you described, to make it wayyyy more difficult to fix even the most simplest thing on this phone. Inverting the motherboard, designed exactly the opposite way of the S4 (as you described), from their standpoint of view, as you'd have to admit, was a brilliant idea on "they're" part.
I've torn apart and fixed many cell/smart phones in my days thus far, but mostly iphones by far. A friend passed
me one of these phones this past week. I've never messed with one before so you already know, even though I
have much knowledge about them, this site was the first I visited about this phone. Needless to say, go figure.
They did a really great job though making this phone one of the most difficult phones to do any type of repair
on. Adhesive sucks. But eh, all is well with a bit of time and patience. Had to replace rear camera and middle
bezel frame. Time to off it....