There are also texture like NSS_Uboat7c_tur7 and SSUboat41_6_hull and others for Turm7c_6,7. Have you tried them as well? The names of textures in Turm7c_# made different intentionally, because conning towers can be used for different models.
As to IIB, name Typ 2B_Hull with the space may be the source of the problem. You can try to repack textures to the IIB and Turm files or replace the name with one without space, something like Typ_2B_Hull.
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Serg's SH4 and SH3 pages
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