im interested in this myself. I just had a plant that turned out to me a male. so instead ripping it out i put it back to veg. and trimmed it to form SOG. I tied the top two branches down to allow the bottom two to grow and catch up. after It recovered for a day and started growing back vertical. I trimmed everything off except one set of leaves below the tip and the tips of course.
this of course is my first attempt at a SOG plant, but this is what im doing to achieve it. Im doing this to a male plant as I have some good fem seeds on the way and dont want to start learning on them.