If Platt has a plans for a plane that you like its very worth while to build from his plans. There is a lot that can be applied to all models. His videos are quite useful also. Just make a core for your control surface and cut a T where your hinges will be. Place stock over the area on one side and fit the hinge. Then do the other side. I cut the hinge slot for more travel than required. Think light in the tail. Use what ever method you like to build out the control surfaces. Ribs for covering, ribs for sheeting or solid light balsa. I make the control surfaces before I cover the sheet the stab surface. Sheeting covers the slots nicely. It is possible to use a long piece of music wire to replace all the pins. This enables removall of the control surface for finishing.

Carl