Not sure about your thinking for the scrog but something that work very well is to construct the frame out of 1/2 or 3/4 inch PVC piping and elbows. You can see an overly complicated version here:

http://boards.cannabis.com/hydroponi...ml#post1743543

All you need are four elbows, some piping and the screen (2" x 3" suggested) and some zip ties to secure the screen. Don't bother with pipe glue. There's no need and moving it at a future date will be easier.
bigsby Reviewed by bigsby on . Emmies Grow Log - White Widow Grow Log (pics coming when I get the ability to post them) 12/06 - Started germination 12/09 - 10 5/5 seeds germinated and transplanted to 6? pots. Light set to 24/0. Light is bare minimum at this point, 4? shop light with standard grow bulbs from hardware store. Ordered $500 of new lights online. 12/13 ?? got programmable thermostat and light timer today, now set to 77° day, 70° night. Also set light timer for 18/6 and added a fan to the closet to evenly distribute heat Rating: 5