I would love to how different pro-haunters have built their wall panel systems. There are so many different options: 1/4", 3/8", 1/2" plywood (or OSB), 2x2, 2x3, 2x4 core, turned wide or flat, 1-sided or 2-sided, square grid or triangular, etc. And how are the panels joined? Offset joints, posts, or something fabricated? How are seams & gaps handled? Do you finish with paint, paper, or fabric?