I really don't think those Slough Creek trout are going to be that fussy about patterns. I'd tie, or buy, some #16 Yellow Humpy's, tie an assortment of BH PT nymphs in #14 & #16, some typical emergers; #16 light wire scud hooks, tail a couple wood duck fibers over which you tie some crinkly brown z-lon, abdomen - wind PT tail fibers and counter wrap with X fine gold wire, Thorax light yellow beaver, wing light dun CDC tied in short.
Oh, I forgot, tie some #14 & #16 rusty spinners with either X-wing hackle from Gary Borger's "Designing Trout Flies", or poly wing spinners.
Here is one variation; the tail are brown turkey fibers (so the ass end will sink) the wing is natural dark dun instead of the light dun. All CDC is not created equal! Most of the packaged CDC at fly shops is just scraps and junk. You are lucky to get a few decent, not great, feathers out of a package. I buy all my CDC from one source and imo I is the best. Trouthunter in Last Chance, ID. They have two or three natural color and a few dyed colors. It comes in a small package and in large, 1/4 ounce, bag. I always buy the large bag and I thin it costs $17.50. It is really worth it as most every feather is very good. The barbules are very dense.
http://www.shop.trouthunt.com/