Mr Wishnevsky has several instruments on Ebay. I checked his youtube videos and they seem quite playable although he seems determined to break all the rules. They remind me of the Jimmy Driftwood guitar which was used to write hundreds of good songs. Nice functional folk art assemblage. Here is a link to his octave mando:
https://www.ebay.com/itm/13453407419...Bk9SR5779cX_YQ
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