Just needs a lit on the top...
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Ziet er erg mooi uit. Je mag mij ook wel een keer leren zo'n ding te maken.

Any ides of the volume of the box? Just wondering if iy was similar in size to the original?

I don't think the volume matters that much. it's more the throughput of air that matters and that's basically the same.

I seem to recall that the nearer to the original volume then the better because these things are optimally designed. Was just interested, nice job though by the way.