NOPE, NOPE, NOPE
DONE THIS ON THE GIANT STICK AND WAS THE BEST THING SINCE THE POCKET ON THE SHIRT!!!!!
here is how you do it so it will work properly.
first mount your tailwheel assembly as far back as possible(HOPEFULLY THE PLANE ALREADY HAS HARDWOOD BACK THERE). i had an old KLETT laying around the shop from a crashed giant scale ultimate. (has to have a hookup on both sides of the tailwheel)
next find a nice spot to mount a servo in the belly of the plane towards the back of the plane.
find a y-harness and use it with the rudder servo, may have to use an extension since the servo will be towards the rear and your other servo is at the stock location(i assume), my rudder and elevator servos are in the tail.
next center up the rudder and the tailwheel and make some pull/pull cables. i had to cross my cables since my tailwheel servo is now mounted upside down. it will be nice if you can use a clevise on one end of the cables for adjustment purposes.
you may want to add some hardpoints for the servo to mount to after you cut the hole for the servo. i used a futaba standard for tailwheel steering on my giant big stick.
you may opt. for hitec 225 if you want to stay away from the weight.
i did not take any pics of my handy work, but it took about an hour and a half to do.

any questions,

WILDCATONE