ok heres another shot at a battle engineer/mechanic build.... the order in which i took things isnt particularly important because im sure theyre all backwards. Feedback is very welcome.

Code:
Character Plan by DDO Character Planner Version 03.12.01
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Level 20 Chaotic Good Drow Male
(1 Fighter \ 6 Rogue \ 13 Artificer) 
Hit Points: 266
Spell Points: 728 
BAB: 14\14\19\24
Fortitude: 11
Reflex: 14
Will: 10

                  Starting          Feat/Enhancement
Abilities        Base Stats          Modified Stats
(30 Point)       (Level 1)             (Level 20)
Strength             10                    12
Dexterity            17                    21
Constitution         14                    16
Intelligence         18                    28
Wisdom                8                    10
Charisma             10                    12

Tomes Used
+1 Tome of Strength used at level 3
+1 Tome of Dexterity used at level 3
+1 Tome of Constitution used at level 3
+1 Tome of Intelligence used at level 3
+1 Tome of Wisdom used at level 3
+1 Tome of Charisma used at level 3
+2 Tome of Strength used at level 7
+2 Tome of Dexterity used at level 7
+2 Tome of Constitution used at level 7
+2 Tome of Intelligence used at level 7
+2 Tome of Wisdom used at level 7
+2 Tome of Charisma used at level 7

                  Starting            Ending          
                 Base Skills        Base Skills       
Skills           (Level 1)          (Level 20)        
Balance               7                 16            
Bluff                 4                  7.5          
Concentration         2                 26            
Diplomacy             4                 13            
Disable Device        8                 32            
Haggle                0                  1            
Heal                 -1                  0            
Hide                  7                 16            
Intimidate            0                  1            
Jump                  4                 13            
Listen               -1                  1            
Move Silently         7                 28            
Open Lock             7                 28            
Perform               n/a               n/a           
Repair                4                 15            
Search                8                 32            
Spot                  3                 21            
Swim                  0                  1            
Tumble                7                 13            
Use Magic Device      4                 24            

Level 1 (Rogue)
Feat: (Past Life) Past Life: Rogue
Feat: (Selected) Point Blank Shot
Feat: (Automatic) Attack
Feat: (Automatic) Drow Spell Resistance
Feat: (Automatic) Elven Keen Senses
Feat: (Automatic) Enchantment Save Bonus
Feat: (Automatic) Exotic Weapon Proficiency: Shuriken
Feat: (Automatic) Heroic Durability
Feat: (Automatic) Immunity to Sleep
Feat: (Automatic) Light Armor Proficiency
Feat: (Automatic) Martial Weapon Proficiency: Rapier
Feat: (Automatic) Martial Weapon Proficiency: Shortsword
Feat: (Automatic) Martial Weapon Proficiency: Shortbow
Feat: (Automatic) Shuriken Expertise
Feat: (Automatic) Simple Weapon Proficiency
Feat: (Automatic) Sneak
Feat: (Automatic) Sneak Attack
Feat: (Automatic) Spell Save Bonus
Feat: (Automatic) Trapfinding
Enhancement: Improved Disable Device I
Enhancement: Improved Open Lock I
Enhancement: Improved Search I
Enhancement: Rogue Improved Trap Sense I


Level 2 (Artificer)
Feat: (Automatic) Artificer Construct Mastery
Feat: (Automatic) Artificer Knowledge: Scrolls
Feat: (Automatic) Exotic Weapon Proficiency: Great Crossbow
Feat: (Automatic) Exotic Weapon Proficiency: Repeating Heavy Crossbow
Feat: (Automatic) Exotic Weapon Proficiency: Repeating Light Crossbow
Feat: (Automatic) Inscribe Artificer Scroll
Feat: (Automatic) Magical Training
Feat: (Automatic) Medium Armor Proficiency
Feat: (Automatic) Rapid Reload
Feat: (Automatic) Revive Iron Defender
Feat: (Automatic) Unleash Iron Defender


Level 3 (Artificer)
Feat: (Selected) Precise Shot
Feat: (Automatic) Artificer Knowledge: Potions
Feat: (Automatic) Defensive Fighting
Feat: (Automatic) Rune Arm Use
Feat: (Automatic) Sunder
Feat: (Automatic) Trip
Enhancement: Rogue Skill Boost I
Enhancement: Artificer Crossbow Damage I
Enhancement: Artificer Improved Rune Arm Use I
Enhancement: Improved Repair I
Enhancement: Force Manipulation I
Enhancement: Artificer Intelligence I


Level 4 (Rogue)
Feat: (Automatic) Evasion
Enhancement: Elven Dexterity I
Enhancement: Rogue Dexterity I


Level 5 (Rogue)
Feat: (Automatic) Trap Sense


Level 6 (Rogue)
Feat: (Automatic) Trapmaking
Feat: (Automatic) Uncanny Dodge


Level 7 (Rogue)
Enhancement: Rogue Skill Boost II
Enhancement: Improved Disable Device II
Enhancement: Improved Open Lock II
Enhancement: Rogue Improved Trap Sense II


Level 8 (Rogue)
Enhancement: Rogue Acid Trap Lore I
Enhancement: Iron Companion
Enhancement: Steel Companion
Enhancement: Rogue Mechanic I
Enhancement: Artificer Wand and Scroll Mastery I


Level 9 (Fighter)
Feat: (Fighter Bonus) Rapid Shot
Feat: (Selected) Toughness
Feat: (Automatic) Heavy Armor Proficiency
Feat: (Automatic) Martial Weapon Proficiency (ALL)
Feat: (Automatic) Shield Proficiency (General)
Feat: (Automatic) Tower Shield Proficiency
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Fighter Toughness I


Level 10 (Artificer)
Feat: (Automatic) Artificer Knowledge: Wands


Level 11 (Artificer)
Feat: (Artificer Bonus) Improved Critical: Ranged Weapons
Enhancement: Artificer Damage Boost I
Enhancement: Artificer Damage Boost II
Enhancement: Uncaring Master
Enhancement: Improved Repair II
Enhancement: Improved Search II
Enhancement: Improved Use Magic Device I


Level 12 (Artificer)
Feat: (Selected) Past Life: Sneak of Shadows
Feat: (Automatic) Artificer Knowledge: Arms and Armor
Feat: (Automatic) Retain Essence


Level 13 (Artificer)


Level 14 (Artificer)
Feat: (Automatic) Artificer Knowledge (ALL)
Enhancement: Artificer Crossbow Attack I
Enhancement: Artificer Battle Engineer I
Enhancement: Artificer Intelligence II
Enhancement: Artificer Wand and Scroll Mastery II


Level 15 (Artificer)
Feat: (Artificer Bonus) Heighten Spell
Feat: (Selected) Improved Precise Shot
Enhancement: Artificer Improved Rune Arm Use II
Enhancement: Rogue Sneak Attack Training I
Enhancement: Force Manipulation II


Level 16 (Artificer)
Enhancement: Artificer Crossbow Damage II
Enhancement: Artificer Rune Arm Overcharge I


Level 17 (Artificer)
Enhancement: Artificer Improved Rune Arm Use III
Enhancement: Fighter Critical Accuracy I


Level 18 (Artificer)
Feat: (Selected) Hamstring


Level 19 (Artificer)
Feat: (Artificer Bonus) Maximize Spell


Level 20 (Artificer)
Feat: (Automatic) Skill Mastery
Enhancement: Mithral Companion
Enhancement: Improved Search III
Enhancement: Improved Search IV
Enhancement: Improved Use Magic Device II
Enhancement: Improved Use Magic Device III
Enhancement: Artificer Intelligence III