this is the link loudblunts gave me and the way Im gonna start force flowering soon. Actually going to get the trashcan here in bout 30mins.
International Cannagraphic Magazine Forums - YUKONS OUTDOOR TRASH CAN SCROG

why dont you take 2 trash cans and cut holes in them, inset topped and train(ed) plant, light proof the holes you cut and cover each side according to what you want it to do. Leave the veg side open for 24hrs a day and cover one side with a lid for 12/12. Do a harvest and switch it around, then try to do it again?
seems easier to do than the box idea....