Pretty cool Randy. I think, if it were me, I'd get some hardwood planks and trim out those 2x4's. It'd look a whole lot nicer, and could still be done on the cheap.
Oak, Birch, Willow, anyone of those, in dimension lumber, can be had pretty cheap and its usually iin stock at Home Depot.
What's on the other side? Plywood?
If so, maybe cover that in the same cloth thats on the front and it'd still be reflective.
You've got the function down pat, and with a little more thought on the form, it'd be first class!