@Binarywhisper,
Glad that this thread can be any help for hints or ideas.
I could arrange a series of step by step explanation on the preparation of glass to concrete part if that would help you greatly. As I'm not a great building construction worker, I have to ask the workers or artistants to explain to me in details how the preparation as well as the glass bonding is done so not to mislead you by my very own explanation.
By the time I write this down, the pond part is already formed and currently is under test for leak-that means the glass are all set up too. I've paid a short visit (now the project and the whole house is paused for a long holiday break - a local custom and to prevent unwanted things happening the whole compound is locked) a while ago and found the two glass parts are already standing strong, holding back a wall of water 70+cm deep. The bad news is I havent been able to take any pic of the structure so no sneak peek pic for you all right now. Didnt bring along my camera and anyway the whole pond area and the viewing windows are covered up because they (contractor) concerned about safety, no scratch should be on the rather expensive glass.
You cannot see much trough the glass and from the surface as its all very murky due to first time water washed everything down; soil, mortar particles, sand, etc. If after leaving the water for several days (I suspect more than 10 days) the water level does not recede too much, then they can call it safe and continue finishing their work. They did made special mix concrete liner along the pond part, filter and the backwall part which receive waterfall, so if everything goes as planned any leak should not be serious.
For sure it look quite intimidating to me at the first glance
