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The picture here although with other emphases looks sort of like what you are describing: https://blog.predatorbdu.com/2011/08/natick-brings-solar-shade-brings-juice.html This idea is a bit extreme! https://homeinabox.blogspot.co.uk/2012/05/container-solutions-india-bangalore.html Nice picture of a thatched roof over a container (near the bottom of the page) here: https://www.tiffanystravels.co.uk/blog/east-coast-rr
However, I would say a local design with some guidance from your side is likely to be the best
all-round solution. I would try to avoid having one big structure due to occasional very strong
winds in that area - better to lose part of the shade system than all of it. If you can make both
the Eastern side window shade/canopy and Western side waiting area shade separate from the
over-container shade then you should get less overall damage in strong winds.
Having a double
skinned with interstitial airflow approach always help reduce the temperatures but well maintained
single layer thatching is very good all round. In S Kivu there may be a tradition of making roofing
tiles? There is in Rwanda (even if much reduced by the 'ban' on cutting down trees). These provide a
heavyweight option that is quieter in the rain than cgi sheeting but you always get some
leakage/drips which if mud is used to bed the tiles can be a bit mucky. I like James's approach -
get the local people involved, have a couple of sessions with them and bash some ideas into shape.
All the best with this.
Steve