I'm missing the repairability score. Guess it must be almost zero for the complete watch, although just replacing the battery must be doable for a skilled repairsman.
On step 23: All portable Nintendo's since the original DS have "sliding clips" for the top screen, ie. you have to slide the outer cover slightly up to open it. This way, no efforts or tools are needed (assuming the "hidden" screws are already out). From the pictures, it looks like it's still the same for the new 3DS XL you opened, or am I wrong?