I'm so impressed by your work. Thank you so much for sharing. I actualy stumbled upon your youtube videos, while searching for glass grown together with trees. I wish to have a glasshouse for years now, but coudn't find a solution that would fullfill my needs.
It must be recycled glas as used in severall earthship designes, because co2 emission etc. After I have seen your work and joint connections I coudn't sleep anymore. Have you ever tried to fill the gaps with bottles or something else? I could imagine to glue a lott of bottles together with a distance keeper that might disappear (rott) over time while the trees are filling the gaps in between. It would also be important to adjust the distances in dependence of the highth. Meaning the tree will be bigger at the bottom results in letting more space inbetween the lower bottles in the first place.
Would be nice to hear your thoughts about it.