I would like to install privacy lattice on top of a cinderblock wall. I can get the lattice and top/bottom caps (to finish the edges) at Home Depot, but they don't seem to have posts to create a structural frame. I need ideas about how to build a frame and how to attach that frame to the block wall. The lattice will be 3' maximum, the block wall is 4-5' high. Please offer ideas and instructions.