I wanted to know if I can cut out the 2x4 under the block glass window in the shower area and put in new wood without removing the tub or taking the window out. There is also a smaller board that sits on top of the 2x4 that needs to be replaced. Possibly, use a saw to cut the 2x4 and then remove the smaller piece on top, put in new wood and secure the 2x4 with some brackets..