When you need to duplicate multiple measurements on a larger project, it can be helpful to use a length of 1x2 or similar stock as a story pole. Cut or select a piece that is longer than the longest cut required. Carefully mark the height, width, depth and length of various parts onto the 1x2. The story pole will speed up marking for cuts, and matching parts will be cut the same.
Clean your drill and router bits often. Use oven cleaner or soak overnight in turpentine. Wipe clean then coat with light oil.