Re servo torque required - Multiplex has an excellent program available at: http://multiplexrc.com/calcservo.htm

The program works well, but has a glitch - It tends to overestimate servo torque required, since it seems to assume that the servo output arm moves through the same angle as the control surface. This error can easily be corrected by simply multiplying the result that the program spits out by the ratio of the control surface deflection to servo arm deflection.