I don't buy the idea of the edges being used as hitches or grapple structures. I like it, but I don't buy it.
The curved edges are too subtle for such a purpose.
If they were real rail-like structures for mounting uses, I think they'd be more pronounced, more substantial, more solid.
As they are, they do seem more like an airfoil or aerodynamic feature rather than a grapple rail of some kind.