Here are a few links to sites that might be of interest to you:
If you've read the captions to some of the photos on this site you already know I built and had bees in a couple of Top Bar Hives for 5 years. I'm not necessarily a big fan, but I wouldn't want to discourage anyone from trying them. They have their good points. They just didn't fit with the way I did things. Here are some simple plans.