I think the reason I haven't done a scrog setup yet is because it's not perfectly clear exactly what I would buy or how to do it. Seems there a bunch of different materiel and ways I could go about it and it doesn't appear that anyone is really selling scrog kits for specific sized tents or anything. I'll probably just make a pvc frame and use zip ties to hold down a piece of trellis netting, maybe 6" squares, or smaller if I can find it. I think the one company that does make something where a scrog could be done from a kit is GeoPot. They make large fabric planters that are held up by a pvc frame and they also sell a little kit to attach pvc to the top at each corner and then you can connect more pvc to that and attach a trellis. Something like this would be perfect for growing straws in my green house. And if the pvc trellis kit is the same diameter pvc for a 3 x3 planter as it is for the 4 x 4 planter. Then I might go with a 3x3 for my 4x4 tent and just plant a few plants in the one large planter and set the whole thing in a 4 x 4 flood tray to use as a large saucer. Would be great if I could just do that and use some type of no till soil growing method and just re use the same soil without having to re amend or add more every time. I'm thinking like two of the 4x4's in my green house or maybe one 4 x even longer would do well for me. Super soil and irrigation on a timer to the green house, a little training and then basically fire and forget with any luck haha.
http://www.geopot.com/products/trellis-kit
http://www.geopot.com/products/black-geoplanter-and-tray-liner-1