Thanks!! For the rock weir, what I did was assemble the waterwall, and mortar it in with the skippy behind it until I had my stones stacked "about" the right height. Then I roughed in where my rock weir would enter the skippy and traced around it. DH cut it out for me (I am too accident prone to use power tools!! LOL) then I layed my bottom stone so that the back end was about two inches inside the skippy, but stuck out over the rock wall enough that I would get a solid stream of water. Then I placed the two upright stones in the slot the same way. Two packages of marine epoxy went underneath the rock on the inside and outside of the skippy, and around all of the edges. Then I filled in the gaps between the side and bottom stones with clear silicone. When all of that dried, I used roofing sealant over the marine epoxy all the way around where the skippy meets stone. Then I mortared in the grout lines over the clear silicone. It might have been overkill, but I didn't want ANY leaks!! On the underside of the rock weir, between the skippy and the fall, I epoxy'd my liner right under my weir joint, so that if it did ever leak, it would roll down my liner, and out a hole in the bottom of the rock wall into the pool. I also had to do it this way because the stone I used is VERY porous and the water leaches through to the backside of the water wall. I still have to attach the liner to the back of the waterwall, but I will take more pics and post later.