Having a few more issues with the next objects, next corner piece when I mark and unwrap its not symetric lick my model, kinda stretched.Other corner is the same, next piece turned out alright. As you can see in the 4th object, no matter how I cut the rail piece the middle is attached to the side in the Uv/image editor, and it is in green. I have uploaded a short video showing this.Any help would be appreciated.
https://drive.google.com/open?id=1nOhF_PPCrm7a01rTaZQ4NSIyzxhHjKgI