Dunno how to answer the question, but if no one comes through the way that you answer the question is to dummy up everything onto the nose of the airplane in such a way that it (A) doesn't have too much weight in the clamps and whatnot, and (B) can be slid forward and backward. Get everything hung more or less where it'll go on the finished plane, toss in half an ounce of lead to account for the wood and glue, then measure where it is when it balances.