I am looking for some diy trap ideas, for the corners(triangle shaped. I am pretty limited on how large and want something that blends well into the corners, next to the 2.3tl's. What is a readily available insulation to get on the cheaper side. OC703? I guess you can say that I am advanced in woodworking as I am a furniture maker and carpenter, which should make it simple for me to construct them. I just want to get rid of the boominess that sometimes happens. Any proven corner traps that aren't imposing?