I'm thinking that I might be better off to try to "cluster" a Pi Zero into the mix, use it to handle the display, a camera and maybe a couple minor sensors. Mainly because that'll probably make the display section easier to set up.

I've searched for and found web pages describing how someone or other set up multiple Pis in a cluster; that's not what I'm looking for. So, does anyone know of how I would set this up? Wiring diagrams for what goes where and how, software commands, that sort of thing? My batter power supply can provide power to two separate items, so it's perfect for this.