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If you mean something like a SB218: That is a straight up Bass Reflex: 1300 mm x 550 mm x 700 mm (51.2" x 21.7" x 27.6") 106 kg (233 lbs).
It would be easy to construct - though I don't know of any direct copies; however a Google Image search on Dual 18 did bring up some DIY efforts.
"Not a Speaker Designer - Not even on the Internet"
"If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."