The king said make the rails thick... and thick they became.
I kinda liked how the rail thickness matched the width of the door frame. Happy mistake.
I used rotate to resolve the rail meeting the ground at the bottom of the rail. I selected the bottom edge of the rectangle with edge select. Moved the 3d cursor to the edge with ‘Cursor to selected’. Chose 3D cursor for the pivot point . Selected the face and rotated 90 degrees along the horizontal axis, Y in my case.