the T stringers are interesting however, I think panel stiffness of this nature can be engineered on the outside of the panel. Imagine if we were talking of a deck made of foam core, If you were to camber that deck as one would the deck of a bridge, the stingers could be added on the outside suspended below the deck with caps also if necessary.

In the end you are forgiving better more efficient expensive core integrity and replacing it with a little more weight (the suspended stringers) and the labor used to make them. This analogy because, the T or I type of stringer is common to aircraft design (where weight is important but cost and labor lesser considerations) and the cambered deck more associated with cheaper bridge construction but also available to shipping.

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