In Italian, an architectural thesis on “Visualizing Innsmouth” in 3D. Freely available in PDF. Well researched and richly illustrated and thus worth perusing even if you can’t read Italian. Of course these days you can also run an unlocked PDF through an auto-translator to get the basic gist of it.
Particular attention was paid to the urban and architectural distribution of the digital model, creating a virtual town that respects the imagined environment as much as possible. The purpose of this reconstruction is to offer the user the possibility of interacting with the space and the buildings.
Also found, in Spanish, “Platonic aesthetics in “Through the Gates of the Silver Key””.