Citrus Pale Ale, Partial Mash Help

[thepliceisright]

Hey everyone, I'm planning on doing a Pale Ale partial mash this weekend. I just wanted some input on this recipe. I also have some Simcoe hops that I need to use, so maybe I could use those in place of something? I'm only doing this in a 3 gallon carboy, so it's not going to be a large recipe, and mainly experimenting with a pale ale. I've only ever brewed brown ales, amber ales and stouts.


Characteristics
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Recipe Gravity: 1.055 OG
Recipe Bitterness: 59 IBU
Recipe Color: 7° SRM
Estimated FG: 1.014
Alcohol by Volume: 5.3%
Alcohol by Weight: 4.2%

Ingredients
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Briess Caramel 10L 1.00 lb, Grain, Mashed
Light DME 2.50 lb, Extract, Extract
Vienna (US) 0.50 lb, Grain, Mashed

Cascade 0.50 oz, Pellet, 20 minutes
Cascade 0.25 oz, Pellet, 7 minutes
Cascade 0.25 oz, Pellet, 0 minutes
Centennial 0.50 oz, Pellet, 60 minutes
Centennial 0.25 oz, Pellet, 20 minutes
Centennial 0.25 oz, Pellet, 7 minutes
Centennial 0.25 oz, Pellet, 0 minutes

1 Blood Orange Zest 1.00 unit, Other, Add 5-10 minutes from flameout
1 Grapefruit Zest 1.00 unit, Other,
2 Mandarain Oranges Zest 1.00 unit, Other,

Notes
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Recipe Notes:
Mash - 154 (60 Minutes)
Sparge - 168