I have a three-foot high rock wall in front of my yard, now barren after I hacked out the old overgrown yews that were there. Some pics:

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I'm debating adding a second rock wall about six feet behind the current one, a couple feet in front of the azaleas. It seems like it would give me a nice planting area in front while adding support.

Does this seem feasible?

The attached link I'm using as inspiration, more in concept than anything else.

Here is a link that might be useful: