There are so many sources of plans for these that it's difficult to limit. Check out the plans links at Wick's Weekend Warriors site, http://wickswww.freeyellow.com/ (an ad page comes up first so just click past it). Next, I would list all the books at your home center, and the same books and more are available from your library, on-line booksellers and local bookstores. Be sure to check the magazines as many of them have had construction articles with plans available. There have even been a few done on home improvement TV shows and they have plans and videotapes available.