I'd agree with Double D. But you will make fine beer with this recipe, so long as your technique is good. Maybe something kind of like an americanized octoberfest, with the dark crystal toffee/roast flavors replacing the melanoidins and american hops featuring prominently.
The bohemian pilsner probably won't add anything to the brew; that's a mashing grain. As a base grain in simple pilsner-malt centered beers such as helles or pilsner it can make the subtle difference between good and great. At the rate of a pound in a steeped grains batch with dark crystal it won't show up. But it won't hurt anything either.