The document you reference deals mostly with wings with sharp leading edges. It would not be as applicable to how the Rasberry would need to be designed, except in the most general sense.

With a bit of work, yes, I think the Rasberry could be a viable airplane or kit but as with all flying wings, it would have some limitations and would probably require a somewhat more experienced pilot. Getting the configuration to be not only stable but predictable and linear in its behavior would be quite a bit of work I would guess.

But given time and money, there have been many wierder things in the air, so yes, eventually the Rasberry could most probably be configured into a pretty slick little airplane.