The joints and paint
… and painting in black, of course…
So the joints where these typical wood joints, with some screw reinforcements… Combined with wood glue they make a quiet robust joint, so the structure can support the glass weight… You have to consider that if you use 10mm glass you can get a final weight from about 40 Kg just in glass….
After this, the next is painting it in black. I used a water based paint that doesnt smell with matt appeareance. The paint is not a critical point since it wont be perceived through the glass.