I’m still pondering this. A while back I looked at various connectors. Since I moved to banana plugs for patching I’ve been looking at binding posts. They occupy very little space, they’re sturdy and they’re very cheap. To connect them up you can use nice thick wire up to say 10awg thickness and terminate it with a spade lug or a banana plug or just thread the wire through the hole in the post and clamp it with the thumbscrew. You can even daisy chain the power easily if the wires are thick enough to support that.
Edit: I’ve made my mind up to go for an even more compact option: PCB mounted screw terminal blocks. They’re reasonably cheap and work with thick wire. They’re also small enough that I may be able to use them in constructing my mignon circuits.