Generally medium would be around 2-3 plots wide and a couple backwards (height doesn't matter too much)
Large would be about 4-5 plots wide, and requires more planning with us,
and then there's giant builds. I'd say JcFinley has a giant build, it's rather large. Looks good though. These are cool, but not as easy to pull off, and the more of these we have the more road we need to build every time. So I mean try to keep your build a little smaller than a 5 plot square.
And then there's things like the Oort Temple in PG, or what enisledLady is planning, which are just straight up massive builds. Not suggested for the town, but not off limits. Plan with us to make it if that's your thing.
Anybody else got a comment on sizes?