I am sorry to hear you have these problems. Was there any damage to the shipping box?

I never had to touch the rails at all.
I did not have to remove the bottom brace and I did only have to put in the supplied screws. Everything was tight and straight, with no rocking. I did have a problem with one cable that got damaged in shipping, but my supplier sent me a replacement by overnight mail that same day. That cable has since been replaced and the machine has many hours on it. All I did was manually level the bed, which took about 15 minutes the first time. And now, it is just like the Energiser Bunny!

I do hope you get it all sorted as it is a pretty good machine in my estimation. Who did you buy it from?