Build playground from recycled materials for minor ethnic kids

My charity organization is planning to open a recycling workshop, all products (like seesaw, trampoline..) are made from discarded car tires, the instructor is a female architect from Columbia, so, of course, this workshop is English speaking, with some help from Vietnamese volunteers
I just want to ask you guys, how much are you willing to pay the fee, includes all stuff like hammer, nails, tire... and you can bring your product back home.
All proceeds will be going to a charity event this lunar year to build a playing ground for ethnic kids in Pa Ủ village, Lai Chau, near the border with China