you still can increase the angle on the "V" so, you can get more rudder movement.
Also add 1 in. to the rudder.
re-inforce the area where the wo0od screws go in the radio comparment hatch.
you can use some carbonfiber tape to reinfprce the wings!
It will be nose heavy so do not be concern adding some weight to the tail!!!

When you are ready for your maidden flight contact me!!
enjoy!!