--Brazil's OSX laid off 315 employees in the last two months
--Company scales back shipyard construction amid doubts about orders
--Investment bank says new plan could be way out of "value trap"
By Luciana Magalhaes
SAO PAULO--Brazilian naval construction OSX Brasil SA (OSXB3.BR), controlled by billionaire Eike Batista, has laid off more than 300 employees as part of a broader reorganization plan to reduce spending and focus on hard orders...