As announced, here are plans for both the Argonaut and Nautilus. Note the raised deck guns platform as main difference, aside from the flooding holes. Note also that for SH4 the model just needs the basic parts, and the proper nodes which call common parts that are already in the SH4 library (propellers, periscopes, torpedo tube doors, etc.) so you don't need to model all of those.
ARGONAUT:
NARWHAL:
CONNING TOWER CONFIGURATIONS:
Good pictures of the ships (V-Boats), some of them showing hull, ruder, propellers, etc. while in dry dock:
http://www.navsource.org/archives/08/04idx.htm
http://www.pigboats.com/subs/v-boats.html