Hi,
I am experimenting now with smaller case setups but have much larger cases for most modules and the challenge is to have enough room for a meaningful setup while still being user friendly. Have you considered a Tiptop mantis case? That would give you two nice wide rows with enough space for a good basic setup and yet remain portable. For my portable rig, what I am planning is two cases: a Doepfer 6u suitcase that gives 168HP for larger modules and a small Intellijel 4u palette case. Even then, I still need to plan carefully and cannot fit a lot in that space. I dislike 2hp sized modules as the knobs tend to be difficult to use in patches. Case in point, my 2hp Cat module while fun is difficult to manipulate when fully patched. A slightly larger 6hp sized module is much more comfortable and easier to handle for me with my fat fingers lol.