Introducing major changes in the design of Tokyo's new National Stadium is a huge risk and would delay construction, says the project director.
Designed by architect Zaha Hadid, the stadium is to be used for the 2019 Rugby World Cup and the 2020 Tokyo Olympics. Its futuristic design was seen as a highlight for Tokyo's Olympic bid.
However, heated debate has been sparked between the central government and the Tokyo Metropolitan Government amid increasing budget estimates and fears that construction may not finish on schedule.