OK, everyone. Here's the update.
I went out earlier, today, and purchased a 2'x4' piece of Auralex. Upon my return home, I immediately sat down to try and figure out how I was going to make a height-adjustable unit on the order of the Reflexion Filter. My wife saw me engrossed with the 'drawing-up' stages, and told me to just go ahead - RIGHT NOW - and get what I really wanted. She really wanted to get it for me, anyway, and initially told me it would be no later than next week. But she won $1000 at the Casino (where she rarely visits), and I now have the Reflexion Filter sitting here before me, in all of its beauty

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I cannot thank you all enough, though, for taking the time that you did to try and help me out. You are all super.