Hello all, have a few questions for you guys. I am building a Goldberg Extra 300 for fun/3D style flying. First off, I know it is not designed to fly 3D as per the kit plans so I am moding it as I go... here is a list of things I doing to it and some things I have questions with reguarding the tail, any input on any of these subjects would be appreciated:

Wings-
I am extending the ailerons to be full length instead of ending 6-7" out from fuse sides and increasing the cord of them a bit. Obviously, separate servos for each as well.

Tail-
Here is where my questions mostly need addressing:
I want to redesign the tail so that the control surfaces are roughly 1:1 size ratio (cordwise anyways) with bigger counterbalances on the elevator and rudder. Going to put one servo on either side of the fuse under the horizontal stab for the elevator, one for each side (not joining them in the middle) and steepen the angle on the elevator inboard lines to allow for more rudder movement which will have the pull-pull system controlling it. Now, what is the feasability of converting the tail on this from flat to airfoils? I was brainstorming the idea of re-designing the tail and building all new stuff up to the same outside dimensions (surface area) as the stock tail but still move the hinging points in to increase the control surfaces. Is this a feasable idea that would work? If so, what airfoil do I use? Copy the wing? or a real Extra? or is there a rule of how to make these combinations work when using airfoils on tails of models?

Thanks for reading and any help/criticism of these ideas.
Brian