== Do we have the technology to build Sailing ship as big as Zheng He's in 2005? == 

 According to the Guinness Book of World Record, the largest sailing ship ever built was France II, in 1911. 

 It measured 415 feet [146m] long and 56 feet [17m] wide.  It had 5 masts, and it was of steel. 

 The question is: Do we possess the technology to build a 9 masts wooden ship that measures 400 feet by 160 feet? 

 Can we today manufacture such a wooden ship and make it seaworthy?