Based on a original instrument
https://sohl.com/category/historical-musical-instruments/
https://marktsack.de/community/index.php?attachment/2388-plan-musette-in-g-historisch-pdf/
https://www.amazon.de/-/en/David-Hogan-Smith/dp/0253207274
https://www.georgrieger.com/de/historische-instrumente-259.html
The author marked this model as their own original creation.