This looks incredible: The 387 Houses of Peter Fritz (1916 – 1992), Insurance Clerk From Vienna. The installation showcases a selection of model buildings curated by Oliver Croy and Oliver Elser. Croy found some of the models in a junk shop!
Cardboard turned into something profound and moving. ("The Lamp of Sacrifice", 286 places of worship, edinburgh, 2004" by nathan coley)
Instruction from Mom: how to make a simple toy house from a cardboard box
Cardboard Brownstone Dollhouses from PLAYFUL | mer mag