Cost breakdown of a submarine?

[Deathblow]

So I'm trying to understand the cost breakdown of a top of the line nuclear sub. How much of the $3 billion pricetage of a SW is from research and development, how much is from raw materials, and hull shaping, how much is from the reactor/powerplant cost, and how much is from auxillary systems, etc. My gut tells me that the cost breakdown can probably be broken down into 5 or 6 categories...

+technology development and testing cost
+hull materials, manufacturing, and shaping
+reactor plant and uranium cost
+electronic systems cost
+auxillary equipment cost
= total cost per sub.

but how much each category contributes, I have no clue..... anyone got any good info? :hmm: I'm guessing that the reactor and the hull shaping process is the most expensive parts of building a sub.