Down in this part of the country those type hinges were called live hinges and I have used them on planes that did not need much surface throw. The nice thing about those type hinges is they want to go back to a flat shape which helps the servo but they also have just the opposite effect when the servo is asked to push or pull against the resistance of the live hinge.
I went ahead and did the hidden type hinge using the medium size Robart hinges and moved the fulcrum (pivot plane) 3/16" into the leading edge of the control surface. This meant that a concave was sanded into the trailing edge of the horizontal stab to accept the rounded leading edge of the elevator and now the elevator pivots inside of the concave portion of the horizontal stab which also seals the joint and no sealing of the joint is needed.