Looking at this combo recently (to compare it to the DB/Inv I've just leveled), this is what I came up with in Mids. Here I'd rather go with Typed defense than positionnal, because that's what you already get with Heightened Senses in WP. The main sets are : kinetic combat (x4), Eradication (x3), Reactive Armor (x4), Cleaving Blow (x3), Aegis (x3).
Of course the ST chain is BF, AS, VS, SS, and it's a beauty because of the final AoE cone + dot.
I remember I had a /WP scrapper built in the same way some time ago, and she was really sturdy, that was impressive !
Good luck with your DB/WP 
Code:
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Like ehina said, go for typed defense with a wp build. If you have the money, get s/l as close to softcap as you can. The build you posted will be plenty survivable, wp all by itself already is. But getting stuff softcapped, or very close, makes a big difference, and it's easier to do that going for typed defenses rather than positional on a wp.
Here is my Dual Blades / Willpower Scrapper build. Any advice?
Hero Plan by Mids' Hero Designer 1.621
http://www.cohplanner.com/
Click this DataLink to open the build!
Jack Scimitar: Level 50 Mutation Scrapper
Primary Power Set: Dual Blades
Secondary Power Set: Willpower
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Body Mastery
Hero Profile:
Level 1: Power Slice -- KntkC'bat-Acc/Dmg:35(A), KntkC'bat-Dmg/EndRdx:35(3), KntkC'bat-Dmg/Rchg:35(7), KntkC'bat-Dmg/EndRdx/Rchg:35(31), KntkC'bat-Knock%:35(37)
Level 1: High Pain Tolerance -- Numna-Heal:50(A), Numna-Heal/EndRdx:50(3), Numna-Heal/Rchg:50(7), Numna-Regen/Rcvry+:50(31), S'fstPrt-ResDam/Def+:30(37)
Level 2: Ablating Strike -- Hectmb-Dmg:50(A), Hectmb-Dmg/Rchg:50(5), Hectmb-Acc/Dmg/Rchg:50(9), Hectmb-Acc/Rchg:50(31), Hectmb-Dam%:50(40), Achilles-ResDeb%:20(43)
Level 4: Fast Healing -- Numna-Heal:50(A), Numna-Heal/EndRdx:50(5), Numna-Heal/Rchg:50(11)
Level 6: Swift -- Run-I:50(A)
Level 8: Typhoon's Edge -- Oblit-Dmg:50(A), Oblit-Acc/Rchg:50(9), Oblit-Dmg/Rchg:50(13), Oblit-Acc/Dmg/Rchg:50(33), Oblit-Acc/Dmg/EndRdx/Rchg:50(40), Oblit-%Dam:50(43)
Level 10: Indomitable Will -- EndRdx-I:30(A), Ksmt-ToHit+:30(11), LkGmblr-Rchg+:50(13)
Level 12: Combat Jumping -- DefBuff-I:50(A)
Level 14: Super Jump -- Zephyr-Travel:50(A), Zephyr-Travel/EndRdx:50(15), Zephyr-ResKB:50(15)
Level 16: Rise to the Challenge -- Numna-Heal:50(A), Numna-Heal/EndRdx:50(17), Numna-Heal/Rchg:50(17)
Level 18: Blinding Feint -- T'Death-Acc/Dmg:40(A), T'Death-Dmg/EndRdx:40(19), T'Death-Dmg/Rchg:40(19), T'Death-Acc/Dmg/EndRdx:40(34), T'Death-Dmg/EndRdx/Rchg:40(40), T'Death-Dam%:40(46)
Level 20: Quick Recovery -- EndMod-I:50(A), P'Shift-EndMod:50(21), P'Shift-EndMod/Rchg:50(21), P'Shift-End%:50(34)
Level 22: Vengeful Slice -- T'Death-Acc/Dmg:40(A), T'Death-Dmg/EndRdx:40(23), T'Death-Dmg/Rchg:40(23), T'Death-Acc/Dmg/EndRdx:40(34), T'Death-Dmg/EndRdx/Rchg:40(42), T'Death-Dam%:40(46)
Level 24: Mind Over Body -- TtmC'tng-ResDam:50(A), TtmC'tng-ResDam/EndRdx:50(25), TtmC'tng-ResDam/Rchg:50(25), TtmC'tng-EndRdx/Rchg:50(36), TtmC'tng-ResDam/EndRdx/Rchg:50(42), TtmC'tng-EndRdx:50(46)
Level 26: Sweeping Strike -- Oblit-Dmg:50(A), Oblit-Acc/Rchg:50(27), Oblit-Dmg/Rchg:50(27), Oblit-Acc/Dmg/Rchg:50(36), Oblit-Acc/Dmg/EndRdx/Rchg:50(42), Oblit-%Dam:50(50)
Level 28: Heightened Senses -- LkGmblr-Def:50(A), LkGmblr-Def/EndRdx:50(29), LkGmblr-Def/EndRdx/Rchg:50(29), LkGmblr-Rchg+:50(36)
Level 30: Kick -- Acc-I:50(A)
Level 32: One Thousand Cuts -- Oblit-Dmg:50(A), Oblit-Acc/Rchg:50(33), Oblit-Dmg/Rchg:50(33), Oblit-Acc/Dmg/Rchg:50(37), Oblit-Acc/Dmg/EndRdx/Rchg:50(43), Oblit-%Dam:50(50)
Level 35: Resurgence -- EndMod-I:50(A)
Level 38: Tough -- RctvArm-ResDam:40(A), RctvArm-ResDam/EndRdx:40(39), RctvArm-ResDam/Rchg:40(39), RctvArm-ResDam/EndRdx/Rchg:40(39)
Level 41: Conserve Power -- RechRdx-I:50(A)
Level 44: Physical Perfection -- EndMod-I:50(A), P'Shift-EndMod:50(45), P'Shift-EndMod/Rchg:50(45), P'Shift-End%:50(45)
Level 47: Weave -- LkGmblr-Def:50(A), LkGmblr-Def/EndRdx:50(48), LkGmblr-Def/EndRdx/Rchg:50(48), LkGmblr-Rchg+:50(48)
Level 49: Assault -- EndRdx-I:50(A), EndRdx-I:50(50)
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Level 1: Brawl -- Acc-I:50(A)
Level 1: Sprint -- Run-I:50(A)
Level 2: Rest -- RechRdx-I:50(A)
Level 1: Critical Hit
Level 4: Ninja Run
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Set Bonus Totals:
@Celestial Lord and @Celestial Lord Too