Scrog help

I am planning on trying scrog real soon "within a few weeks to a month" running aero with 2000w. Anyway I have 3 strains I want to run that are all different flowering periods, one is a 7 to 9 week, the other is around 9 week and the last is 11 to 13 weeks. Should I scrog all these on the same screen? this would be prefered and just cut the ready plants out as needed while the others stay growing in it? or should I get a screen for each strain? The other problem is I grow perpetually so as 1 crop leaves the other goes in so if i cut the 7 week strain it will be replaced that day or so leaving me no time to ever clean the screen. Does that sound like a bad idea? I am sure I could rig something up to make 3 different screens if I need to. I plan on going to the home depot today for some materials to make the screen. Anyone have any suggestions for some good scrog screen besides chicken wire? I am thinking some kind of string or weed eater string strung across some pvc supported by pvc legs.

I think I am going to go with plant training wire sold at home depot. I fount it on their site, looks pretty good. I just need to figure out if i need 3 screens or 1 big one. I think I will just make 3 screens to play it safe and have 3 plants per screen. I run 3 aero setups side by side in an 8x8 grow tent. I just need to figure out exact dimensions by looking in my tent to make the screen sizes optimal.