Thank you @Lugia for detailed feedback.
It would be foolish not to listen to experienced users as a beginner. Understood on the size of the rack. Expanding it will be wise and pair down from there.
I already own uModII but as this is my first move into the rack I'm not completely set on the set up and believe that it's better to take suggestions of more experienced users then try to learn through errors. I'm sure there will be plenty down the road anyway.
If I understand correctly it would be beneficial:
1. loose pico drum
2. no Circadian Rhythms (use stand alone machine)
3. need to add VCA (Erica synth is V2 is a good option here?), attenuators (something like Maths?) and logic (can Maths serve dual purpose for logic and attenuator)
4. Boolean logic by Adventure Audio?
Thank you again for the guidance.