The best solution in my opinion is buy one, but if I really must build one, I should start with putting together a machine shop, since the pump will almost surely need to be made of metal. Instead of spending several money of thousands of dollars on machine tools and metals, I might probably need to take a course in drafting or CAD design.

After a number of failed and/or unsatisfactory attempts at building a pump, I may come up with one that works. Since i am living in a Ethiopia where pumps are incredibly costly or else simple but inefficient, My best option is to see what all my neighbors are doing to solve their water supply needs.

I can actually buy pumps for under 9600 Ethiopian Birr which is around 70 USD but if I have really restricted requirements, the price may be much higher. By the same token, building one follows the same rules. I have a friend of the machine shop, as I also have a well requiring a medium duty deep well pump. For the 9600 ETB, I spent on pump, controllers, wiring, tubing and valves, I could NEVER have done built that myself. Yes, I can assembled that and installed it myself, but building it all is a huge work in my view

Let me know your on this.