I have a home that was just put in on the other side of my fence. I am looking to extend up my current fence of 6ft. another 2-3ft. I am not sure if I want to do the entire 70ft length of it or just extend three spots where I see into their windows say 2ft. up and a few feet across. The current fence is wood cedar. Should I just frame in a few spots on top of old fence or?