I don't know about the EZ3 but I do know that the Z44 comes with the crib, twin, queen and king rails. I haven't decided if I will stain it or not. Might just depend if I get to it before the cog wheels get here.
I plan on just starting at the bottom. I read in the directions to mark your top and backing every 6 inches along the edges so that when you are working on it, and rolling it up, you know that you are keeping the same tension top and bottom.