If you live in or are visiting the Philippines, you might consider dropping by the Sarao Jeepney Factory in Las Pinas, Philippines. Started by Leandro Sarao, the company has been building jeepneys since 1953. The factory is open to the public. There’s a short description about the place from the Trail of Asia travel blog.
Las Pinas is south of Manila. If you are north of Manila, you might check out M.D. Juan, which is in Caloocan City.