Read about this on minecraft.net/en-us/article/coding-ye-olde-london

Generates a seed-based random medieval house in the selection box. Pack them together by overlapping the selection box.

Some details are here: http://imgur.com/a/6vgtH

v5 caches already rendered houses and saves a copy of each in the mcedit binary directory. Also includes some processing and layout tools. Contact me for details.