Verticle growing

I was looking for info on verticle growing search didn't help much. I remember a post that had info on all the known verticle systems such as price and reasonable estimates on grows with weed. Info like this would be helpful. I am planning on building my own so I want to look at as many different configurations as I can. Any links would and info would be helpful. I was also wondering why verticle systems don't seem to be very popular. Most all weed growers want a large yield and a verticle grow can double the yield of pretty much any grow without the need for more light. I thought maby its because of the cost for a system but they are cheap if you make one yourself.:thumbsup: