I am starting my riser this weekend and I think I've read every possible article I could find to prep for construction. All my calculations are good with regard to height and size, I am floating the riser the auralex spacer things (forgot what they're called), filling the riser with insulation up to 85% full, and cutting 4" holes across the front for absorption. What am I missing? Any important aspects of building the riser that any of you figured out that helped. I want as quality of a tactile response as I can get, very sturdy, and simple at the same time. Thanks.