First off thats just a pile of rocks now it needs to have something done to it. I am glad to hear that you will be taking this project a step further to ensure proper flow.
You mentioned taking the rock all the way to the overflow, I say take it out of the water break the surface, it will only make it appear that the rock continues on when viewing from the front.
That drain from the skimmer looks like it is splashing all over the place. I can see what it has splashed already in the pic, that looks to be a large place that salt creep is going to look bad. I hate cleaning slat off of anything and I don't have anything splashing that much and I have too much creep. Put an elbow on that and drop some pipe to just over the surface.
You mentioned taking the rock all the way to the overflow, I say take it out of the water break the surface, it will only make it appear that the rock continues on when viewing from the front.
That drain from the skimmer looks like it is splashing all over the place. I can see what it has splashed already in the pic, that looks to be a large place that salt creep is going to look bad. I hate cleaning slat off of anything and I don't have anything splashing that much and I have too much creep. Put an elbow on that and drop some pipe to just over the surface.