Based on some measurements that could found here:
https://www.amazon.de/Ancient-Music-Instruments-Ireland-Britain/dp/1514175371
https://www.historicbrass.org/edocman/hbj-1993/HBSJ_1993_JL01_005_Downey.pdf
https://www.ancientmusicireland.com/
It's no accurate reconstruction but should play in C#-D. Playing technique like a didgeridoo.
Update 07.02.24:
Mistakes on the connceting pins are fixed.
The author marked this model as their own original creation.