The most excellent English thesis on the Nichiren Gohonzon by Ken Mandara

https://www.academia.edu/34929335/The_mandalas_of_S%C5%8Dkagakkai_and_Nichiren_Sh%C5%8Dsh%C5%AB_in_recent_history?fbclid=IwAR2aSEdOFvPvUoW2lNLJjBCBsFOUFKaQ_HFRPPk1em2ojGlfVTWrkb7P9eU

How Nichiren’s disciples were influenced by the Gohonzon they received and the moji-mandala versus the tridimensional honzon (The Journal of Nichiren Buddhist Studies)