If the wood has already been dried, it should not be a big problem. It also depends on the species of wood. Since you are in Turkey, I don't know about the species of wood you may be using. But since razor scales are so small, there should not be much wood movement. To be safe, if the wood has already been dried (in a wood kiln or at least a year in the open air for a piece no more than a couple of centimeters thick) cut a piece of wood two or three times as thick and wide as you need. Let it sit in the open air in your home for a couple of days and then cut it to the final dimensions. That way, if the wood bends while it adjusts to the indoors temperature and humidity, there will be enough material left over to make the scales even if you have to cut away any bent parts. After you make the scales and attach them, it helps to coat them with shellac and / or a lacquer to protect it from warping when it gets wet.