Built by a local welder with standard tools (no high tech), with local material (~ 50 Euro, except the rear wheelchair wheels) and tested by a 9-year old double amputee. All, organized, bought, built and tested, in only 3 days.
I got a mail from Kenya about “developing a low-cost, foldable, off-road wheel chairs for disabled children in rural Africa” at spring 2015.
That is why I got the idea with the wheelbarrow. Well, investigating, I saw a photo of a wheelbarrow race in Kenia :)