[phaser]

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.

[freakynit]

Great.. start simple, listen to comminity feedback, improve, iterate..