I'll let others with more direct experience with these modules provide specific feedback.
As a side note, I have the ES-9. It's great, but it takes some figuring out. It is, however, very deep, so double check the specs of your rack before deciding where to put it.
From a general perspective, though, you seem to have created an effects rack for handlng external inputs and signals, but do not have many ways of accessing the many controllable parameters that make this rack so potentially powerful. If you are serious about using this with something like ableton or vcv rack, then this feedback might be moot, but I highly recommend more modulators and vcas. I see the Disting there, which is supposed to be very powerful and has tons of algorithms, but might not be the best choice for live playing given the size of the display. You have a lot of 1u space left, so those should probably go towards utilities.
Do you ever intend to use this instument standalone, without external inputs? Also, when you're planning on triggering with drums, do you mean an electric kit that can send out midi, or do you mean using an envelope follower on an audio signal from recording live drums?