GCD- I hear you, but I noticed that in the video that Russ Bailey and guide were only using 2 3 hole bricks to weigh down the porcupine. I realize that the legs will settle into the mud on bottom. The dammed reservoir that will receive the structure has wind generated current. The structure will be sunk in approx 20 fow. I may devise a heavier concrete weight with a pvc T partially sunk in the concrete. I can then glue the T to the bottom of a short piece of pipe hanging from the "trunk" and put a screw into the t for added security.

Your suggestion is appreciated and will be acted upon. Thank you.