Nice explanation Bubble!
I will do it as you said, lots of identical square pots, that can be placed around the rooftop in any fashion imaginable.
I'm currently doing a lot of composting, because soon I'm gonna need A LOT of good soil for the many new pots.
Good soil is expensive (in that amount), thus why not just make my own compost and mix it with free earth soil to make my own good soil?
I had one bin before, today I increased that into 5 bins.
5 bins full of kitchen waste and maize pods.
My preferred method is keeping the bin lid open for flies to get inside.
Then after a few days, I put on a fine screen mesh on the head of bin, to prevent newly born flies to escape out of the system.
So they keep reproducing inside the bin, and they do this until there's no food for them inside the bin, then they all die and become fast decomposing food for microbs.
Using this method I've made a lot of compost in the past.
Since flies cannot just eat your materials and then run away, you end up with a lot more compost than if you left the bin open.
And the compost is ready in a month or two, depending on the season.
I just love compost and composting, it looks like magic to me.
THE LAST QUESTION:
Since cement is only sold in bulk (+200kg) here, obviously I can't get my hands on cement, unless I go crazy and buy 200kg, and the bulk remaining of it will be wasted due to air moisture after sometime.
My favorite material is plaster of paris, it's cheap and can be bought in any amount I like.
Mixed with paper, it makes a wonderful material with many benefits.
It's very light, and the casting process also will be a lot shorter in time, since 5 minutes after pouring it inside the mold, it will harden up, and you can remove the pot and use the mold for making another pot again.
That way I can make 20-30 pots in some hours, and let them dry in the sun for 1 day, and they're ready to go.
My only concern is the longevity if left to be in contact with water/moisture.
Does pots made of paper and plaster of paris have the same properties of hypertufa regarding porousness and longevity?