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Found a little error in there:I used 4x 70cm x 18cm x 1.8cm Boards for the sides
I made a slightly different variation of this bed. I changed the measures to something that fit better for my balcony (little bit larger and metric units). I also added more bottom pieces and added fleece planting liner instead of the mesh. For simplicity, I simply used self-cutting screws instead of bolts and insert nuts. I also used some oil for the wood finish, to make the bed last longer. Here are my measures in metric units:4x 1.45cm x 18cm x 1.8cm Boards 4x 50cm x 18cm x 1.8cm Boards (side)4x 90cm x 5.4cm x 5.4cm posts (legs)6x 73.6cm x 18cm x 1.8 cm (bottom)Till now the narrow boards plus the planting liner seems to be a good solution to keep enough water in the bed, without drowning the plants.