Dear all,
In my understanding is nearly impossible to add normals to towers (I failed all trials), but I found a good compromise working and tuning textures and maps.
Hereafter you can find the S-18 with specular mask reworked and new bump map. Now the tower is well integrated with the hull color... I think it is quite good.

S-18 with new bump map and specular mask.
I've done new textures (based on RGB colors from Foobar) for all the subs - but with original SH4 hull holes configuration (Foobars has added some holes - I think he depicted a - modified - late war hull configuration).
May I ask some feedback?
Bye,
Mith