This is a world with 49 plots (7x7). Each plot is 81x81 inside the sidewalks. This is to represent the size of a city block in Portland, OR (which is 80mx80m) while having a nice odd number to work with.

Sidewalks are 3 blocks wide and wrap all the way around each plot. This can be easily expanded to be larger if needed with either WorldEdit or MCEdit. (WorldEdit was used for the creation). The screenshot was taken at 48 chunk render distance. It is actually quite large.