Warrior, Galena and Nugget are generally used for bittering, (although I have heard of Nugget being used for dry hopping), so I'm not sure how much you're going to get from adding them that late in the boil. If it were me I'd use the Columbus, Summit and Willamette for my late adds and dry hops (maybe use a bit of the Nugget late as well). Then I'd calculate an estimated IBU from the late adds, and use the bittering hops at the beginning of the boil to bring me in range of the IBU level I'm shooting for.
That was my original plan. But then I got adventurous / carried away and decided to mix the hops up more. So in the end I ran with this recipe.
2oz Carafa III (for color)
3oz each of Amarillo, Columbus, Galena, Nugget, Summit and Willamette
0.25oz of each at 15, 10, 7.5, 5, 2.5 and 1 minutes
0.5 oz of each for aroma added at 180F during cooling
1 oz of each for dry hopping
I'm looking at 10.65 OG, 95 IBUs, 15 SRM. I know, maybe a little too bitter, but what the hey, there may be a little residual sweetness from the C60. Its falls somewhere between American and Imperial IPA.
Oh, and I forgot the Irish Moss in my haste to measure out that many hops. So crash cooling and maybe gelatin it is...