kirscp again your doing great work........you got a good plan.....if your skimmer got to low,thats were the water level is....new plan, thats what you got to work with.....if the water level is 4 " low....and your still in the building process......why not for your viewing pleasure and all of our,s........take your top 2x6 and lay it side ways to get your water level right to the bottom eadge of your trim boards.......think about this ...crack a beer , stand back in your yard , look at the pond , you wont see the water,,,the finner .and thinner the eadge is the more water and fish you will see........again you are doing a great job......this would give you a bigger water fall, less to build up on the land scaping.......your pics really help....here is a few pic on my raised pond ,the fish would not clime on the eadge like they do when i dont have the camera.......hide the liner...its all about what you dont see....great job