I'd not use the carapils- you have enough crystal already in there. I'd probably go with .5 pound of a lighter crystal, though, like 10L, and then .5 pound of 60L.
It looks good to me, but I don't think it would be very Ruination-ish. When I taste Ruination (unfortunately, not very often since it's not distributed here), I get centennial overload, in a good way. I love cascades, though, and think it would be a nice beer.
I'd move some of the cascades (or add more) for later additions- at 10, 5, 0 minutes and dryhopping.
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