The following changes are required to change levelable items from version 2.x to the new version 3.0.  All changes are made in the levelable weapon/armor/clothing/jewel scripts

1.
After
	private int m_Points;
Add
	private int m_MaxLevel;

2.
After
	public LevelKryss() : base()
	{
Add
		 MaxLevel = LevelItems.DefaultMaxLevel;

3. In the Serialize override, increase the version by 1.  For example,
Change
	writer.Write((int)0);
To	
	writer.Write((int)1);

Now, after the line you just changed, Add
	writer.Write(m_MaxLevel);

4. In the Deserialize override...
Change
	// DONT FORGET TO DESERIALIZE LEVEL, EXPERIENCE, AND POINTS
	m_Experience = reader.ReadInt();
	m_Level = reader.ReadInt();
	m_Points = reader.ReadInt();
To
	switch (version)
	{
		case 1:
		{
			m_MaxLevel = reader.ReadInt();

                        goto case 0;
		}
                case 0:
		{
                        // DONT FORGET TO DESERIALIZE LEVEL, EXPERIENCE, AND POINTS
                        m_Experience = reader.ReadInt();
                        m_Level = reader.ReadInt();
                        m_Points = reader.ReadInt();

                        break;
		}
	}

This is assuming that you had no previous version cases, if you did then modify the version case numbers appropriately.

5. In the GetProperties override, 
Change
	if ( LevelItemManager.DisplayExpProp )
To
	if ( LevelItems.DisplayExpProp )

6. In the ILevelable Members Region, add the following (I added right after the line "#region ILevelable Members"
	// This one will return our private m_MaxLevel variable.
        [CommandProperty(AccessLevel.GameMaster)]
        public int MaxLevel
        {
            get
            {
                return m_MaxLevel;
            }
            set
            {
                // This keeps gms from setting the level to an outrageous value
                if (value > LevelItems.MaxLevelsCap)
                    value = LevelItems.MaxLevelsCap;

                // This keeps gms from setting the level to 0 or a negative value
                if (value < 1)
                    value = 1;

                // Sets new level.
                if (m_MaxLevel != value)
                {
                    m_MaxLevel = value;
                }
            }
        }

7. Within the Experience ILevelable Member declaration,
Change
				if ( m_Experience > LevelItemManager.ExpTable[LevelItemManager.Levels - 1] )
					m_Experience = LevelItemManager.ExpTable[LevelItemManager.Levels - 1];
To
				if ( m_Experience > LevelItemManager.ExpTable[LevelItems.MaxLevelsCap - 1] )
					m_Experience = LevelItemManager.ExpTable[LevelItems.MaxLevelsCap - 1];


Finally...
8. Within the Level ILevelable Member declaration,
Change
				if ( value > LevelItemManager.Levels )
					value = LevelItemManager.Levels;
To
				if ( value > LevelItems.MaxLevelsCap )
					value = LevelItems.MaxLevelsCap;