When I am looking to make a style I usually start at the first link below, then head on to the 2nd link for grain ideas. Your grains look good but ya may want to throw in some carapils just for a bit if head retention. Something else I have looking at doing since I started AG beers is when making a specificly american style beer I have been splitting my base malt between 2 and 6 row so maybe you might want to go with 5.5 of 2 row and 5.5 of 6 row. As for the hops I would go 1 oz of each just for managment of inventory. 30 minutes on the Chinooks, 15 minutes on the Centenials, and dry hop with the Cascades.
10A. American Pale Ale
Usually moderate to strong hop aroma from dry hopping or late kettle additions of American hop varieties. A citrusy hop character is very common, but not required. Low to moderate maltiness supports the hop presentation, and may optionally show small amounts of specialty malt character (bready, toasty, biscuity). Fruity esters vary from moderate to none. No diacetyl. Dry hopping (if used) may add grassy notes, although this character should not be excessive.
Pale golden to deep amber. Moderately large white to off-white head with good retention. Generally quite clear, although dry-hopped versions may be slightly hazy.
Flavor: Usually a moderate to high hop flavor, often showing a citrusy American hop character (although other hop varieties may be used). Low to moderately high clean malt character supports the hop presentation, and may optionally show small amounts of specialty malt character (bready, toasty, biscuity). The balance is typically towards the late hops and bitterness, but the malt presence can be substantial. Caramel flavors are usually restrained or absent. Fruity esters can be moderate to none. Moderate to high hop bitterness with a medium to dry finish. Hop flavor and bitterness often lingers into the finish. No diacetyl. Dry hopping (if used) may add grassy notes, although this character should not be excessive.
Mouthfeel: Medium-light to medium body. Carbonation moderate to high. Overall smooth finish without astringency often associated with high hopping rates.
Refreshing and hoppy, yet with sufficient supporting malt.
History: An American adaptation of English pale ale, reflecting indigenous ingredients (hops, malt, yeast, and water). Often lighter in color, cleaner in fermentation by-products, and having less caramel flavors than English counterparts.
There is some overlap in color between American pale ale and American amber ale. The American pale ale will generally be cleaner, have a less caramelly malt profile, less body, and often more finishing hops.
Ingredients: Pale ale malt, typically American two-row. American hops, often but not always ones with a citrusy character. American ale yeast. Water can vary in sulfate content, but carbonate content should be relatively low. Specialty grains may add character and complexity, but generally make up a relatively small portion of the grist. Grains that add malt flavor and richness, light sweetness, and toasty or bready notes are often used (along with late hops) to differentiate brands.
1.045 - 1.060 1.010 - 1.015 30 - 45+ 5 - 14 4.5 - 6%
Sierra Nevada Pale Ale, Stone Pale Ale, Great Lakes Burning River Pale Ale, Full Sail Pale Ale, Three Floyds X-Tra Pale Ale, Anderson Valley Poleeko Gold Pale Ale, Left Hand Brewing Jackman's Pale Ale, Pyramid Pale Ale, Deschutes Mirror Pond