I'm guessing you have other gear, synths, sound modules etc?
And bear in mind that closely spaced 2hp-sized module are very hard to use once they are patched and close to other modules.
-- wishbonebrewery

you guess right. it's my first system and I ended up with some extra room to fill

I think the issue you say about the 2hp drum kit it's not its real problem with me, since once a CV is patched to for instance to the Pamela, the knob underneath doesn't really need to be moved again. But yes, those 3 can stay together but can't be placed every where, you are right

I am not sure if adding more effects to the drum kit or replacing it with something bigger like for instance the LEPs, not necessarily right now, I am not taking new modules every month