Building Pumpernickel recipe

First off, hope everyone had a great Thanksgiving :)

Time has come to start working on a recipe for our annual Reindeer Run.  I'm thinking of a raisin pump.  I know there are recipes out there, but I like to build my own.  I've reached a decision point, and thought some of you might be able to offer some comments.  I'm not sure what combination of flours to use.  Oddly enough, none of the recipes I've researched online actually use pumpernickel flour.  (For those of you unaware,  pumpernickel is to rye flour as whole wheat is to white flour).  I'm thinking of going with something like 45% white, 25% pumpernickel, 25% rye, and 5% corn meal.  What do you guys think?  Push up the white to 55% and reduce the rye and pump?