I am building a TF Spitfire and followed the thread called spit fire build. In the thread it shows more scale like hinging where the stab, rudder and airlerons are rounded instead of beveled and the fixed surfaces are extended with light ply to create a pocket of sorts to hide the hinges. Can anyone show me more detail on this change.. It would seem to me that that the hinging point would have to be recessed back into the control surface so the distance would be critical at each point. I am assuming the set back would be equal to 1/2 the diameter but since the control surfaces taper would this distance be the same or different for each hinge along the length of each control surface. Robarts hinges are used for this application, I can see that. Also, how do they make the pocket for the hinge to swing in moving parts, as keeping this perfect would seem imperative for a good finished look.

Thanks for any help with this,
Randy