So, what started out as one Rackbrute 6U, grew to add a 3U as well and of course I have filled up both and now have bought another Rackbrute 6U. The images below include what I have so far. I'm considering adding Queen of Pentacles to the second Rackbrute (which will fill the 30 HP remaining nicely) OR the combination of SSF Entity Percussion/BIA/Befaco Kickall (opinions on those options...or a better one?)

ModularGrid Rack
ModularGrid Rack

I am trying to conceive of a use for the Rackbrute 3U and thinking of some sort of sequencing/modulation unit that sits in front of my two Rackbrute 6Us. Note I also have a Beatstep Pro. I moved the Quadrax + Expander from the 6U above to the 3U and replaced it with the BitBox Micro (on first 6U)...also already had PAMs with the mmMIDI and moved it as well to the 3U

Would appreciate any guidance or suggestions on what to fill up my Rackbrute 3U with. Here is what I had in mind below:
ModularGrid Rack
Would love to hear feedback on any and all of the above...

JB