The Expedition series of modules is specifically meant for doubling, even tripling (RGB) in comparison to the discontinued Visionary series where triples were common.
cascaded staircase and nested keys.
2x navigator can pull some great gradients. I always love double mapper! worth the money really.
Id say get 2-3 video oscillators, and then start doubling on the staircase and doorways. So much patch complexity will come from doubles/triples.
Ive had around 5-6 of my BSO Quad Video Mixer, and had a good amount of multiples in the visionary lineup in my prior system.