For folk who use Sketchup, the free 3D modelling app, you may want to see these amazingly intricate downloadable models of traditional Japanese architecture ( pages in Japanese, though ):
http://sketchupsyaji.web.fc2.com/DL.html

You can download the Google warehouse versions, as linked there.

These might be useful for folk who like to render background images in-situ with Sketchup, or use Sketchup to convert the models themselves for use in other apps. 

I sometimes convert the models, depending on complexity, for use in Poser or DAZ Studio.

In fact, do look out for loads of Japanese models in Google Warehouse.  There are some really nice ones there.  My favourite creators you may want to search for there, are:
noburu
kazu
and
goodtaste

( and if you want to look at amazing 3D Chinese models, try Tunnytan or moonlander1954 )

Eternal Hobbyist