Composting leaves with coffee grounds
I've hoarded about 50 gals of coffee grounds (10 5 gal buckets) with the idea of combining them with leaves in a compost pile this fall. I'm thinking of doing a pallet bin and layering leaves and grounds. What kind of ratio of leaves to grounds do I want, and does anybody have any words of wisdom on how to best construct this pile? I don't really have the means of shredding leaves beforehand.
My guess is the pile (4'x4'x5'high) will still be carbon heavy, so I have ~10 gals of fish offal to add to it, if nitrogen is indeed lacking. (I'm not worried about animals and have learned to control odors.)
How would I calculate how much coffee grounds is needed to optimally balance out this size pile?