Tang Band 1808 in Madisound BK-20 cab?

I have a set of 1808s that I've been playing with, and trying to decide the best use of them. I came across the Madisound BK-20 horn flat pack kit and am thinking those could be a good route to try with these speakers. I realize the 1808 have a significantly higher Qt. Anybody build this kit or have any helpful thoughts?
 
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