The turnscrew tuner is actually two parts, a small cylinder, set to be relatively flat, and an extruded circle, created in the Free Form modeler. The string peg, above right, is simply a circle in the Free Form modeler with five cross sections. The point representing cross section four is dragged onto the point for Cross section five. The strings will be the last item added to the guitar. As is shown on the right, you have a number of choices to make in CorelDream for textures.
Wood grain is available through several avenues.
You can import a bitmap image to use as texture, such as a rectangle you have filled with CorelDraw V8's wood grain fill. Or, you can create a bitmap from Corel Texture that is wooden like, and use this for a mapped texture. Or, you can use the Natural Functions in the Shader Editor dialog box pull down and work with different wood grain effects. Or, you can scan a piece of wood and use it as a texture, if you like. The options are myriad, and completely up to you.