Vasek,
you can easily hide a little tailwheel in there, but what I've found on my fixed tail skid triplane, is that you can, with juidicious use of rudder and elevator, lift the tail with a blast of power and use the prop blast on the rudder to spin the airplane. another trick I used was to make a steerable tail skid which on grass works as well as a steerable tailwheel.
Good luck
Mike