Hey!
Nice project! Here is something to consider (I would thnk):
Design will be quite edgy on CG - you'd have to get it just right.
Elevator control will be quite edgy too.
As far as mixing-in brakes it will be quite a challenge.
Thrust angle (aligning the motor) has to be just right too.
I'd move fins a bit more backwards to give it a bit more directional stability since your fus has a lot of side footage.
Looking forward for some flight trials to see if I am right or wrong.
cheers,
Mark