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Building devices to absorb low frequencies means you've gotta add a "low-pass" filter. Just as you would using EQ.
A "filter" might be anything from kitchen-towels to a piece of hardboard. It depends on how low you want to filter. I usually add a plastic screen, it'll reflect mid/high but will absorb low/midlow. If tests read out I've still got too much low vs high (read: too much high absorption), I'll add another or thicker screen. Or I make it a slatted device.
My advise is to add a plastic sheet. You are planning on using wall (broadband) absorbers, aren't you?
And.. Lupo's got a point; don't forget to build is fire-proof (if possible)!
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