I would not just guess at an enclosure size and port length/diameter. Each woofer has different needs in terms of enclosure design and is usually listed on the instructions they come with. As for building it out of "light wood", don't. Enclosure have to be stiff or they start acting like a passive speaker and robbing the woofer of output. If you want a decent enclosure that's light and stiff, fiberglass is the go.
Hope this helps,
Darren
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