Here's a link to a very successful tennis ladder in Austin Texas. The current singles round has almost 100 rungs with 3 to 4 players per rung. Each round lasts about 2.5 to 3 weeks. Players can drop in or out for each round. Not sure how much you will be able to see without being a member but here's the link: http://www.austin*********.org/index.php
Not sure why I can post a valid link, but just google Austin Tennis Net.