I'd look into quantizers, sample and hold circuits, and definitely LOGIC modules. I'm not sure if the MiniBrute has any of this.

I would also consider a Pamela's New Workout or Temps Utile as they are great for creating and manipulating alternative rhythms like Euclidean. Xaoc's Zadar is also a great source for modulation that evolves.

The modules you could part with (IMHO) are:
A-170 (you have the Maths)
A-183 (check out Kona for attenuator cables)
A-180 (passive mults can be done outside of the case with all types of splitters)

If you get stuck for room, they would be the first modules I'd pull from this build to put more modules in.