I'd make a couple of changes to that wing design:
Ailerons and flaps, 1 servo per surface With a 12 foot span, are you sure one servo per surface will be enough?
Symmetrical, no idea what airfoil yet I'd go with semi-symmetrical as that would be more stable in a training roll
0 degrees dihedral, 1.5 ish degrees washout I'd go with a couple of degrees of dihedral to prevent the wings from looking like they are drooping and to make it easier for an inexperienced pilot to fly