Share 'Copper flute?'

I live in Estonia. No bamboos here. So I was thinking to use copper tube. I find this http://www.aflauta.com.br/hist/bamboo.pdf Problem is inside diameter and wall thickness. If I'm getting it right for every key is right inside diameter and length I can buy straight copper tubes/pipes: 15mm(outside diameter) x 1,05mm(Wall thickness)  1,05x2=2.1mm 15-2.1=12.9mm(inside diameter) 18 x 1,0 1,0x…