This bed is not functional with the 4 slats.   I used it for an airbnb and got a complaint the first night the guest slept on the bed.  Only 4 slats means the bed is not firm at all and leaves a ripple look with the mattress, when I called to get 4 more slats I was denied.  The advertisement for this bed needs to be more clear. If you add a boxspring it is not deep enough and would look really weird as well. The look of the bed is nice but it needs extra support to actually work and this should be shown in the pictures online. Thx