TLAM you are tempting me out of retirement.
You see your subs with double hulls, are you basically joining two cylinders together? Like with the Soryu and a box with the Sang 'O'
Just a thought but something I tried when I was making similar subs that had a turtle deck and joined the main hull I cut away a hole in the main hull and the extruded edges and 'sculpted' the turtle deck. Meant I didn't have any wasted polygons.
They are fine looking models though.
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