alt Hacker NewsAs other comments have implied, but not explicitly said, they do their own engineering already with what they have.
Since materials can be scarce and inconsistent, much of it is improvised. That in no way diminishes their efforts, results, or knowledge. If anything, that's way more impressive. Lots of engineers in the first world will throw a tantrum if they can't have things exactly their way and probably still make something that doesn't work as well. Entire businesses have shit their pants and gone bankrupt the moment a part is discontinued.
Trying to do better than the people who live there is not only arrogant, but it's own variation of Chesterton's Fence.
EDIT: I can't help myself and have to post an engineerguy video. It's too important of a topic to not drive this point home crystal clear by someone who is far more respected than me.
"Building a Cathedral without Science or Mathematics: The Engineering Method Explained"
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As someone who has spent some time in sub-saharan Africa, I can tell you that there is lots that can be done if just seeing the possibilities.
Not everyone everywhere are "engineering oriented", and having people with the skills and eye for practical solutions based on available materials, can help tons, and also open up people's imagination for what can be done.
In fact, this goes for northern Europe too, just that more people can manage without home-built solutions and can "buy away the problem" here.
Also, people where immensely thankful e.g. when my quite clever and crafty father managed to repair a water tank tower that'd been broken for months and years, by sourcing some local material, coming up with a repair design, and having local welders create it, etc etc.
I suspect you've never spent any meaningful amount of time in the local environments, or you wouldn't have made this comment.
As I elaborated on in another comment, it is commonplace to find that people who have little to no education and resources are missing countless opportunities to implement simple improvements to almost everything.
This mindset of "locals know best" is, frankly, toxic. (just think about the locals wherever you live to see how incompetent they are as well)
What is needed is genuine collaboration and communication between people living in whatever situation and others who are fortunate to have more access to information, resources, education on critical thinking etc...
Over here in the UK I've seen some pretty original bicycle adaptation with electric motors and even a 2 stroke engine added to aid propulsion.
In India there is a word for this kind of thing Jugaad
https://en.wikipedia.org/wiki/Jugaad