I understand
As I said it will make noise - which is what you want
I would check the depth of the 2hp mixer it may be too deep for the case (allow a bit for the power ribbon)
tbh I'd probably want this: https://www.modulargrid.net/e/bastl-instruments-waver instead of the 2hp mixer - which I think would leave you with 2 hp free still - maybe a multiple
And then I'd just play and see what else I needed down the line, if anything
BUT just reviewing I noticed you asked if you should add another filter - and to be honest I don't see one
I see a clock module, a rhythm generator, a percussion voice, a noise voice (I'm guessing that you are seeing this as a filter) and a mixer
I quickly read through the specs of the shard on modulargrid and it's mostly a highly modulatable vco and recommends running it through both a resonant filter and clouds, but it can be used to process sound
So I would also look to replace both the clock and the numeric repetitor with Pam's New Workout - which will give you a clock and 8 channels of triggers/envelopes (so modulation as well as percussive triggers)
This would free up a further 6hp for a filter - if you can squeeze the 2hp LPF into the case (see point above) you would then be able to cram in a happy nerding fxAid - which will give you access to about 100 effects - some of which I am sure will work well with what you are going for - possibly including granular processing
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities