Thanks @Lugia for chiming in!

Yeah, since I ever started planning my case, the mixer conundrum stays one of the main PIA... Many options there, but none that really checks all boxes. I'd like to have CV control over panning, stereo Send/Return (2x if possible), a nice interface, not too big... maybe I have build my own!! :D (if I only knew how.)

I know of the Frap Tools new instalment, but adding to the price tag they take quite some space and are still a bit cryptic for me. Knob.farm seems like a good option for the Sends (and would free some space on the 1U row), and with support from another module for some of the functions, could get me nearer the goal. I've checked Vortices and sort of even get it, but that interface is a bit all over the place for me.
Do you have any other combos you know about to help me on that front?

Regarding the 1U row, thanks for taking the time to put that together. I seem to remember reading that the original I/O was bigger and they wanted to give people the choice of having both interfaces or not. Plus you can separate them spacially, that might make sense in some setups!
I thought of adding a Duatt+Vca in there with possibly an LPG also, that would give me some more control over modulation, and to buff it even more, since I ditched the Black Sequencer (for now), I'm considering the Plum Audio 1u version of O&C. It takes quite some space, but I'm hoping I can then combine that with some interesting, crazy, modulation on the 3u space. Would you car to chime in?

The Buffered Mult is there mainly to divide Harmonaigs root (exclusively :D) to other oscillators once the Saïch is there, as that one would take all of them. I'm a classic double bass player in my working hours, so harmony still plays a big part on the sounds I go for. But if you don't think I'd need it and could do with stackables or even those starfish thingies, I would free also that space for something more interesting. Gladly!

Thanks again! I look forward for more input from you and the Jims, Farkas, Garfields, Kels, and some I'm sure forgetting right now! You make this community a lot less poor in their banks and richer in their noodling lives!

Cheers!
Jorge