i have a living room that is 16x20 with 10ft ceiling. I want to build a false fireplace with a nice mantle that will be sized correctly to the room. the wall i want to place the mantle on is 16ft across wth a 10 ft ceiling. where can i find a good plan that i can use.

Try checking out these websites, www.doityourself.com, www.build.com, and www.build.com. You might find what you're looking for there or they have several links to other sites.

Sorry, that 3rd site should have been www.buildonline.com. Guess my fingers got tired on the previous post.