There is a long, fascinating article in Hebrew about the “Secret to Iron Dome’s Success” — I will translate just a few paragraphs for you which I found fascinating:
“At the beginning of our journey [to create the Iron Dome], it was simply almost impossible. We believed we would succeed, but the challenge was unprecedented.
In retrospect, its clear that the [time and financial] limitations imposed on the project, which seemed insurmountable, are what led to extremely creative and successful ideas. The simplicity is not only in the design, but in the manufacturing process. The manufacturers have told us this is the simplest rocket they have ever produced.
As scientists, its true we dream of sitting in offices with unlimited time and budgets to create perfect products.
Yet reality and limitations forced us to “break our heads.”
There are rocket components that are FORTY TIMES CHEAPER [in Iron Dome] than those we normally would purchase. I can even give you a scoop — this is the only rocket in the world which includes parts from toys from “Toys R Us”.
One day, I brought my son’s toy car to work. We passed it from one to another and saw that it has components that would be useful for us. More than that, I cannot tell you… (Source).