Many moons ago, TSR / Wizards of the Coast released a series of paper buildings for use in D&D games. They’re now available free for the downloading. Any medieval / fantasy wargamer will find these useful. I think they’ve really stood the test of time.
Paper Models
Japanese Tori Paper Model
Here’s a paper model of a Tori — the traditional Japanese gateway. You should be able to scale the model with software and your printer to fit your needs.