oatmeal brown ale?

here is my recipe idea, 10 gallon
18lbs marris otter
2lbs quick oats
1lb crystal 60L
1lb crystal 40L
1/4-1/2lb chocolate
4 oz cascade 60 min (home grown no idea what aau)
1 oz fuggles 30 min
1 oz fuggles 10 min
1 oz cascade 0 min
nottingham dry yeast
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single infusion 60 min rest 156
7 gallons 174 strike temp
2 batch spares 4.5 gallons 180
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what effect would some black patten malt have if I dont have enough chocolate. I know its out of style just a thought.
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any ideas?

changing the hop schedule to
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2oz cascade 60min
2.5oz cascade 25min
1oz fuggles 5min
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I think I might need a little more color

wow Im really on my own with this one

Im thinking about mashing a little thicker may be 1qt a lb and doing a mash out.

the more I think about that hop schedule the more I want to scale back.

I have no idea how home grown hops will be in this beer but I guess Im gonna find out.

I think there was an article in BYO a few months back about using oatmeal....there may have been a recipe for a brown in there.