Exclusive: Suppliers question Tesla's goals for Model 3 output

By Paul Lienert and Alexandria Sage DETROIT/SAN FRANCISCO (Reuters) - Tesla Motors Inc has surprised parts makers with plans to move up the launch of high-volume production of its Model 3 to 2018, two years earlier than planned - an acceleration that supplier executives and industry consultants said would be difficult to achieve and potentially costly. In the past three months, Tesla has told suppliers the company was doubling its original production projections to 100,000 Model 3s in 2017 and 4