Looks great!
I think your plan to make that lower part less thick will look better.
an alternative might just be to add more of a protruding lower "lip" in the from of the bottom piece
One problem area that many people attempt to fix with the Moebius kit is where the head meets the neck. At the top, there should be no step up or elevation difference
Might be too late to address that, but if not...
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Also, some other ref pics in case you have not seen these. Supposedly these are the ZIOC renders used for the show
There are a lot more here
ZOIC: Battlestar Galactica TV Series - Meshweaver
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