We have a house full lots of Pax wardrobes, some tips, pay attention to the hinges, because there are 3.
Look at the internal storage in store, because the wooden drawer runners attach to the bottom of the drawer so you cannot put one on the very bottom, because of the hinges. So there is a gap.
The baskets runners are at the top, but they don't hold as much weight. and again those can't go at the immediate top because of the hinges.
When you are constructing them, you lay the side panels next to each other and screw in the cam lock screws (which will hold the side to the top/bottom.)
But before you attach the top or bottom pieces, screw in any drawer runners to the sides. It is much easier to do this when flat than inside the wardrobe when it is erected, especially for single 50cm wide ones. It also makes it easier to line up the runners on each side whilst they are flat on the floor rather than counting the holes.
The hanging rail can be put in when erected. Don't forgot to turn the feet all the way up before you move it and then use them to level the wardrobe as it will possible sit on carpet gripper making the back higher than the front. And finally remember that it doesn't allow for skirting board so they will sit off the wall ever so slightly.
Hope this helps.