I was fascinated with this book and hope that someone can pinpoint if any of these characters are based on historical figures of the time. Possibly someone with good history background of the period can tell the book's audience.
I don't know about the financial shenanigans involving war profiteers, but the story of the CSS Alabama is totally correct. It was in fact built by Lairds in Great Britain without armaments and christened with another name. It was then shipped off to some island in the Atlantic and fitted out with armament and re-christened the "CSS Alabama". Also, it's true that after the war, the victors sued the British Gov't and won $15M in damages (calculated as the equivalent of $125M in today's money). International maritime law was changed because of this suit. If you want to read more, do a wikipedia search of "CSS Alabama" and "Alabama Claims".
So that much is based on fact, I have no idea about the purely financial shenanigans but some of it didn't really ring true. For example, I doubt that the Brits wouldn't have been able to figure out that Stone was financing a Russian ship building operation in the far east of Russia.