*Important note*  Recommended mattress height per box is 6", NOT 12"!   This bed is exceptionally well made and very sturdy.  Couple of holes didn't line up but I have had that problem with every single product I have purchased from Wayfair.  At least this bed doesn't feel like it's going to fall apart.  Disappointing that upper bunk says it can only support 200 lbs because its seems like it could hold an elephant.