I've searched for documents dealing with the type VIIC/42 that could help Cobalt building this beast, didn't find anything.
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The Type VIIC/42 was designed in 1942 and 1943 to replace the aging Type VIIC. It would have had a much stronger pressure hull, with skin thickness up to 28 mm, and would have dived twice as deep as the previous VIICs. These boats would have been very similar in external appearance to the VIIC/41 but with two periscopes in the tower and would have carried two more torpedoes.
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http://uboat.net/types/viic-42.htm