Idea:

Mod for minetest (or maybe external app?) that would allow to declare buildings in config file, nix-style

For example, you have built several houses and converted them into such config file. Then you have built street without houses, converted it too but then specified that empty spaces can be filled with contents of external config.

After that, you can quickly generate world with that street and houses, declaring which empty spaces to fill with which houses in config file for world.