What will you use the Hendrikson for?
W/ can be used as a delay among other things, so it might make sense closer to the end of the chain.
W/ also likes a steady CV offset source sometimes, to set speed, amount of “delay feedback”, etc. You could get that out of Teletype, but that might be a waste of a CV channel, particularly with that many sound sources. You could get it from Cold Mac but that would use up Cold Mac. This might benefit from an active attenuverter that can provide static offsets, something like Shades or Triatt or whichever.
These are just thoughts 
Do you have particular musical plans for this, or is it more for experimentation and playful exploration?
Also, have you considered an Intellijel 4U or their upcoming palette cases? I know the 4U is less minimal, and I believe you’re touring (at least, if you’re the person I recently bought a Control File from who said they were touring and needing to consolidate). But on the other hand, you could get some of the utilities that this feels like it’s needing in the 1U row. That would also let you move headphones up there, freeing a little space.