Additional info obtained from:

• Корабли ВМФ СССР. Многоцелевые ПЛ и ПЛ спецназначания (roughly: "Ships of the USSR - Multirole-Submarines and Specialpurpose-Submarines"), Y. Apalkov, Saint Petersburg, 2002.
• Корабли ВМФ СССР. РПКСН и многоцелевые ПЛ. (roughly: "Ships of the USSR - SSBNs and multi-purpose submarines"), Y. Apalkov, Saint Petersburg, 2002.

Information, regarding specific details of construction, were found in photos from forum Airbase "Kron"

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