for the versa wing, i scored it 50% and bent it. Packaging tape was used to make it strong. But, mine is too heavy, i think. I am not sure.

The main problems with Flying wings design is that, they are very difficult to balance. getting right CG is very difficult. The only option left is to put heavy lipo at the front , which further increases the weight and flying characteristics also.

You cannot bend this biofoam. If you want to make an airfoil then simply cut the foam and then keep them together and apply a piece of fiber tape along the cut. Once you have set the desired shape(by making multiple cuts) apply hot glue inside the cavity on the opposite side if the taped edge.

you CAN bend it... if you want a smooth aerofoil, use 3mm biofoam for the top of the wing, and 5mm for the bottom. now glue only the leading edge of the 3mm biofoam, and slowly bend it backwards, while having a friend heat it with a hairdryer (or leave the sheet in the sun for an hour) this will help it curve nice and smooth... dont forget to reinforce the leading edge afterwards with tape!
hope this helps
regards
aniket

Aniket- I am talking about the one which I used, 5mm.
You cannot bend it