What keeps the bottom rails together when putting up the wall?. I have not done this yet, but instructions just say when inserting the rails into the bottom plate, leave a 5/8 gap between the ends of the rails. I made 5/8 temporary spacers.. But the rails do not lock in, they just lay in the bracket. I'm going to use stakes on the outside, but seems like these would move all over the place with out locking together. Is it normal for the rails to just lay in the lower bracket? Maybe I'm just over thinking things...I just trying to cover everything.