I wonder how much the SubName cfg file has to do with the relation between the 3D artwork, and those settings. For example:
S-18
-----
[Properties]
PeriscopeDepth=15.5;meters
SnorkelDepth=9.2;meters
Gato
----
[Properties]
PeriscopeDepth=18.6;meters
SnorkelDepth=12.8;meters
The Gato's snorkel depth (radar depth) is very similar to the S-18's periscope depth...