Tunable didges like that were common 20 years ago. Problem is, being parallel bore, they don't have the weird and wonderful anharmonic overtones you get with a made-by-termites model.

I once found a didgeridoo-sized length of Pyrex laboratory tubing in a skip and gave it to a local didgist. She was going to improve it by softening it over a flame to introduce small random kinks and wiggles.