OOP developement

I am attempting to make a .Net port of FreeCiv using
C#.  I was wondering if those who have done OO ports
such as Java make more or less a direct translation of
the C code or do they map out the functionality and
use a more OO approach?  I had first thought of making
UML diagrams for the functionality as well.  Does this
already exist somewhere?

Thanks,
Bryon

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