If you need similar technical ceramics documentation:

Because much of the prototype rolling stock covered in Spezial 81 has no modern, ready-to-run (RTR) model available. Hobbyists who want to model these unique locomotives must resort to scratch-building or heavy kitbashing, for which the MIBA Spezial 81 provides the only publicly available blueprints.

Guardians of the High Seas: Analyzing the Coastal Artillery of Miba Spezial 81 *

(terms you can use to find official or sales pages)