Mecha assembly plant

This is a future world where big corporations become large and more powerful than most of the countries. And quickly they're facing 2 variants of further existence - first is to decide their arguments with old fashion war, second is to decide them in battle between the gigantic mecha robots. They choose the second one. It helps to save many lives and production of such robots gives significant boost to the industry and science base of the corporations and all nations. Here is one of the assembling plants where the mechas prototype parts are assembled and tested.