I see it more akin to a foam or honeycomb core in a glass fiber or carbon fiber laminate.
I will take the freedom to say something about this (without delving too deep) because of its consequences for us shareholders.
The interior of the structural battery pack can only sort of work like a honeycomb, with all the nice structural properties that come with it, if all the individual cels are glued to each other.
But in stead of the straight walls inside of a true honeycomb, the walls will be curved because of the shape of the individual cells, therefore the 'sort of'.
My engineering gut says that this aspect will make it not as strong and as stiff as a true honeycomb.
Nonetheless, glueing the cells to each other will certainly help to improve the strength and stiffness of the pack, and so adding to the total stiffness of the body of the car.
Creating the possibility to use less material and being lighter with at least the same strength, stiffness and driving characteristics as competitors who do not have it.
In the end for us here: more margin per produced Tesla compared to the competition.
The only main unknown catch I see now: when being part of the structure, will the deformation of cells (tiny as it may be), have negative effects on them?
Pretty sure that Tesla will examine/test this thoroughly.