Wing mounting on 3D plane
 

I'm graduating from making flying wings and am researching how to secure the wings on a tailed aircraft.

Instead of depron I'm thinking of going with Home depot eps foam and cutting wings, using a tall, flat, thin fuselage with a carbon rod down center.

I've looked for pictures and sites on mounting wings so they stay straight.

My best thought so far is to have crossway carbon spars that attach to the wing or have thicker foam in center (about 1 inch) which doesn't seem like enough.

Any how to's?