Regarding custom buildings, it will likely start as a simple JSON setting some variables like workerCapacity, studentCapacity, depth, height, etc and a voxel 3D file, so players can create cities with custom architectural styles.
Like a city with only stalin-era and soviet-era buildings. Or something where all the residents live in victorian townhouses.
Like a city with only stalin-era and soviet-era buildings. Or something where all the residents live in victorian townhouses.