Please edit away the title to anything more suitable; I am not a native English speaker.
Now to the point. An apartment in temperate climate. A garden of about half a cubic meter of soil spread in pots. My dream is to transfer this into about 2 cubic meters of "one-big-pot" resulting in a home-owned forest clearing with grass one can sit on and some tomatoes/beans/lattices/etc to marvel at.
My first idea was a rubber pool liner inside a ytong-constructed cube. After some experiments with carefully watering plants in a no-drainage pots I concluded that as absurd.
The next modification is a 20cm layer of coarse stones, wrapped in stainless mesh on the bottom of it and a small pipe to allow drainage.
How does that sound?