Select a keyboard that will allow you to wrap the wood in one axis. More than one axis will complicate the process to an unbelievable level. Remove the top of the keyboard and all of the keys . Do not damage the key stems as yo will be reusing them later. Steam the wood to allow it to bend to shape. If you choose a very hard wood it will crack and splinter as you bend it around the keyboard frame. The next step is to use cyanoacrylate to adhere the wood to long edge of the keyboard. Leave some overlap on the sides of the keyboard , you will be cutting them off later. With a thin seam of thin quick dry glue adhere the wood to the plastic frame until the entire face is covered. Once the forward face is covered. Cut the side bars to cover the sides of the face of the plastic frame. Once the sides and top of the keyboard are covered with wood cut out the holes for the keys. some will be square and some round. square holes will require a great deal of extra care for the wood will split.
Step 2: Stylize the surface
Here is the departure between a worn surface look and a new ready to be abused look. prep the keyholes and cut and additional feature holes and markers now to save yourself the headache of damaging the finish later. Use sandpaper that matches the hardness of the wood to finish the surface and take any blemishes out. The finer the wood grain the finer the sandpaper you want to finish with. Use a light poly spray to seal the wood . Repeat over and over with the finest sandpaper available until satisfied.