Thanks for the advice! I'm not actually planning on getting most of those specific 2hp modules pictured, they more just represent fairly brand-agnostic utility type bits. In the end I'll likely get whatever's small enough to fit that I can find for cheap (eg tiptop drums or somthing), so I don't imagine the knob size will be too much of a problem. As to where I'll get the hp to back this plan (beyond just the 10ish I have here) I'll most likely drop the least used ~15% of modules, only I can't plan for what those will be yet, so, for now 2hp it is. (I also have fairly small fingers so that's all a touch less of an issue for me even if I do go for the full 2hp line I've shown above).
On a broader scale what do ya think of the rack as a whole? I'm looking for something sequencer heavy I can use to record songs in a multitracked fashion, but not entirely useless when untethered either. Does this about cover that in your mind?