Build question - Tempest/Assassin w/ trap skills?

[CajunTech]

Returning to DDO after a 3+ year break and attempting a new build. Would appreciate any feedback on the viability of this build in endgame content (solo and group). The idea is to provide max trap skills, acceptable melee dps, self healing, and the ability to use ranged DPS when needed. I plan to use a dual Kopesh setup with this character.

I would also be aiming for the Shdowdancer Epic Destiny (I haven't found much info on these) and plan to buy tomes as I gain the in game funds to do so.

Character Plan by DDO Character Planner Version 03.14.02
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Level 20 Chaotic Good Human Male
(1 Barbarian \ 7 Rogue \ 12 Ranger) 
Hit Points: 282
Spell Points: 140 
BAB: 18\18\23\28\28
Fortitude: 15
Reflex: 16
Will: 5

                  Starting          Feat/Enhancement
Abilities        Base Stats          Modified Stats
(32 Point)       (Level 1)             (Level 20)
Strength             16                    21
Dexterity            14                    16
Constitution         16                    16
Intelligence         14                    14
Wisdom                8                     8
Charisma              8                     8

                  Starting            Ending          
                 Base Skills        Base Skills       
Skills           (Level 1)          (Level 20)        
Balance               6                 14            
Bluff                -1                 -1            
Concentration         3                  3            
Diplomacy             3                 22            
Disable Device        6                 25            
Haggle               -1                 -1            
Heal                 -1                 -1            
Hide                  6                 22            
Intimidate           -1                 -1            
Jump                  7                 15            
Listen               -1                 -1            
Move Silently         6                 22            
Open Lock             6                 26            
Perform              n/a               n/a            
Repair                2                  2            
Search                6                 25            
Spot                  3                 22            
Swim                  6                  8            
Tumble                3                  4            
Use Magic Device      3                 22            

Level 1 (Rogue)
Feat: (Selected) Dodge
Feat: (Human Bonus) Mobility
Enhancement: Rogue Damage Boost I
Enhancement: Rogue Sneak Attack Training I
Enhancement: Improved Hide I
Enhancement: Improved Move Silently I


Level 2 (Barbarian)


Level 3 (Ranger)
Feat: (Selected) Exotic Weapon Proficiency: Khopesh
Feat: (Favored Enemy) Favored Enemy: Undead
Enhancement: Ranger Sprint Boost I
Enhancement: Human Improved Recovery I
Enhancement: Human Versatility I


Level 4 (Ranger)
Enhancement: Rogue Haste Boost I
Enhancement: Human Versatility II
Enhancement: Ranger Devotion I
Enhancement: Ranger Dexterity I


Level 5 (Rogue)
Enhancement: Rogue Sneak Attack Accuracy I
Enhancement: Rogue Wand and Scroll Mastery I


Level 6 (Ranger)
Feat: (Selected) Toughness
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Barbarian Toughness I


Level 7 (Ranger)
Enhancement: Ranger Sprint Boost II
Enhancement: Human Versatility III
Enhancement: Ranger Devotion II


Level 8 (Ranger)
Feat: (Favored Enemy) Favored Enemy: Giant


Level 9 (Rogue)
Feat: (Selected) Spring Attack


Level 10 (Ranger)
Enhancement: Human Versatility IV
Enhancement: Ranger Tempest I
Enhancement: Ranger Dexterity II


Level 11 (Ranger)
Enhancement: Ranger Sprint Boost III


Level 12 (Ranger)
Feat: (Selected) Improved Critical: Slashing Weapons
Enhancement: Ranger Devotion III


Level 13 (Rogue)
Enhancement: Rogue Damage Boost II
Enhancement: Rogue Haste Boost II
Enhancement: Rogue Subtle Backstabbing I
Enhancement: Improved Hide II
Enhancement: Improved Move Silently II


Level 14 (Ranger)


Level 15 (Ranger)
Feat: (Favored Enemy) Favored Enemy: Evil Outsider
Feat: (Selected) Oversized Two Weapon Fighting
Enhancement: Ranger Sprint Boost IV
Enhancement: Ranger Devotion IV


Level 16 (Ranger)
Enhancement: Human Improved Recovery II


Level 17 (Ranger)
Enhancement: Ranger Tempest II


Level 18 (Rogue)
Feat: (Selected) Nimble Fingers
Enhancement: Rogue Wand and Scroll Mastery II


Level 19 (Rogue)
Enhancement: Rogue Assassin I


Level 20 (Rogue)
Enhancement: Rogue Damage Boost III
Enhancement: Rogue Haste Boost III
Enhancement: Rogue Sneak Attack Training II

[Kinerd]

#1 thing by far and away is to get GTWF if you want to use TWF. It is a very large power increase. If you don't want to use tomes, burn level-ups into Dex. If you use your first three level-ups, then you'll be ready to take it at 15, which is where I think your BAB allows it.

Much lesser but still significant concerns:
-You don't need 7 rogue levels (or Nimble Fingers) to do traps. Especially as a human primarily-ranger, you will not be crunched for skill points and can keep all skills maxed.
-Assassin 1 does not offer very much for the cost. 3 AP for a redundant Damage boost, 4 AP on generally useless skills, 4 AP for Assassin 1 itself = 8 AP for 3.5 SA damage. Not a good return.
-With those said, 7 rogue is still a decently strong split. Haste Boost 3 is very strong with Human Versatility.
-Swap the 7 AP you spend on Sprint Boosts 3-4 for Human Improved Recovery 3. Even Sprint Boost 1 is plenty.
-There is a new to-hit formula which instead of subtracting from to-hit divides into it. Among other things, this makes flat to-hit bonuses such as OTWF very useless. (Proficiency is a special case; you want to keep proficiency.) I would get Maximize instead, it makes a big difference for self-healing.