public void buildTank_player(EntityPlayer player,EnumFacing inside){
  if (getWorld().isRemote)   return;
  buildPlayer=player;
  buildTank(inside);
}

public void buildTank_player ( EntityPlayer player , EnumFacing inside ) { if ( getWorld ( ) . isRemote ) return ; buildPlayer = player ; buildTank ( inside ) ; }
let a player build a tank !
