Here's what I think:
Everybody can build on a 30 by 30 or smaller lot, it can be irregularly shaped and not a perfect square.
-For something bigger players mark the lot then request ingame or on the forums confirmation just so they don't build stuff where it shouldn't go.
-Let's stick the towers closer to the towers and the smaller houses closer to each other.
-We have lots of flat space in the ocean so we can make gigantic plazas and green parks.
-Everyone can get lawns and treelines next to their home.
-We will also have skybridges with rail on them, for easy access between higher towers and the main station.
-Towers can have floating platforms with greenery attached to them, preferably circular platforms.
Example without the towers
I also made a drawing about how I see New Venice in it's basic form: