changes for Orientation.java

//change
   private boolean isOnVine(int j_offset) {
      return getBaseBlockId(j_offset) == Block.vine.blockID;
   }
//to
   private boolean isOnVine(int j_offset) {
      return isvine(getBaseBlockId(j_offset);
   }

//change
   private boolean isBehindVine(int j_offset) {
      return getRemoteBlockId(j_offset) == Block.vine.blockID;
   }
//to
   private boolean isBehindVine(int j_offset) {
      return isVine(getRemoteBlockId(j_offset));
   }
//change
public static boolean isLadderOrVine(int blockId) {
      return blockId == Block.ladder.blockID || blockId == Block.vine.blockID || isBlockIdOfType(blockId, _ladderKitLadderTypes);
   }
//to
public static boolean isLadderOrVine(int blockId) {
      return isLadder(blockId) || isVine(blockId) || isBlockIdOfType(blockId, _ladderKitLadderTypes);
   }

//and in the bottom where you set _isLadder using reflection, the signature has changed

_isLadder = Reflect.GetMethod(Block.class, new Name("isLadder"), false, new Class[]{World.class, Integer.TYPE, Integer.TYPE, Integer.TYPE});

//should be: (paired with the correct import of net.minecraft.entity.EntityLivingBase)
_isLadder = Reflect.GetMethod(Block.class, new Name("isLadder"), false, new Class[]{World.class, Integer.TYPE, Integer.TYPE, Integer.TYPE, EntityLivingBase.class});

//which of course means you're going to have to change the signature of
public static boolean isClimbable(World world, int i, int j, int k)

//to

public static boolean isClimbable(World world, int i, int j, int k, EntityLivingBase entity)