OhHo - you plan an enlargement - seem, that you like itThe final plan is evolutionary, I just planned to add houses to make a small street ...
Here's a quick sketch that I use as a basis:
The more I watch this build the more fascinated I become - just out of interest, what are you using as "mortar"? - ie what glue are you using to stick the bricks & tiles etc together? Is everything natural stone colour or are you painting some/all of them? What are you gonna do with the streets - will you cobble them?