Hey Adrien 
,
Welcome to the Wakademy forum.
You’re in exactly the right place 
.
I don’t make didgeridoos myself, but I’m sure @Christophe_E, @Sébastien and @Philippe_Bechu will be happy to give you some answers 
.
If you’d like to share some photos of your builds, there are threads for that:
here: Montrez votre didgeridoo et racontez son histoire
or here: Montres-moi ton Didg et je te dirai qui tu es
Welcome anyway !!!