Mighty nice work there Tuomo(as always). Immaculate!
I like your trial of this boo, previously unheard of for bowmaking. Pretty expensive stuff for me to get, but if you're near the supplier I can see the attraction. Sounds like an ideal material. I did a little more research and apparently there are a few other species of bamboo, with similar or slightly longer internodes
https://bambubatu.com/bamboo-with-the-longest-internodes/ . I have no idea if they match the strength of other types but it looks like there is still plenty of experimenting left to be done by enterprising bowyers. Whether they can be easily sourced is another matter.