- Adjust defense scores based on your adjustments above.
- If your changes "should" change attacks, don't change the attack bonus. But change the damage expression so that the ability score modifier "fits". If the monster uses a weapon, best give it a weapon that can (after being sized appropriately) reach the damage expression. This way, you can handle the disarm/sunder like powers in 4E better. (Just exchange damage dice if the weapon changes)
- If you want to add any "secondary" attacks that don't use the standard statistics (like giving a melee brute a statistic for firing his bow), use his primary attack bonus, modify for the appropriate defense, and reduce the bonus by the bonus difference between primary and secondary stat.