Bed Risers We Have A Sleep # Mattress, On Box Springs With Bed Risers?

We have a sleep # mattress, on box springs with bed risers? - bed risers

The center of the upper riser bed, apparently bored, that we have a serious crack in the middle. Must fix this problem, ask if the mattress is required? Can I build on the measurement of height (not tape) and the mattress can be dispensed with, I have more storage under the bed? Any suggestions to get the amount of the bed (and storage) do not tip when it is pushed on the bed or blow through?