Natural stone steps on flat ground approaching front entrance

I currently have an older small deck with two steps as my front entrance into my home. (The deck isn't fastened to the house, but only into the ground with four 6x6 posts.

I'd like to replace this deck with natural stone steps as shown in the link i've provided. Most likely to be 6ft in length.

Is it ok for me to stack the stone steps on top of eachother?

I would need to stack 3 or 4 in order to get to the bottom of the door, which leads me to wonder if this will be too much weight directly beside the house as each step will weight between 250-500 pounds each.

Is there another method to do this other than having to stack them?

The ground at my front entrance is completely flat, see the links below for the style of step I would like:

http://oakvillestone.com/steps/