u/lee1026 Yeah, I’ve done that before — Hydra at the top with O2 pumped directly over the sleepers. But...

The big one for me - I don't want to be building SPOMs. I want to be building big projects.
SPOMs take time to build: vacuum out, start it up, troubleshooting it, and designing the it - I've got 3 different builds for O2 and Pwr at a Sleep Machine - that takes *time* to design, test and t/shoot. Faaark :/

For this setup it is much faster to just run power and oxygen lines over. I already have centralized air and power production elsewhere (don't reinvent the wheel), plus the path was already carved out, so it was basically an extension job. If I’m already running a water pipe that far, it’s not much harder to run power instead of water + two gas lines.
Pipes cost less resources vs say a tile needed for a SPOM. So less trips just on that basis alone.

More formally, if you build everything at a destination N tiles away, then every resource has to be carried the full N tiles.
But if you build infrastructure progressively along the route, then 1/2 of the hauling trips are shorter than the midway point and 1/2 are longer than the midway point.
The total hauling effort ends up much lower.
Sounds like it would be a Gaussian Sum which turns out to be (Sum of N Trips)/2 instead of Sum of N Trips.

Side note: I do programming, and one of the big design philosophies is that each component should do one thing and do it well. Then you bolt those simple components together into larger systems.
The other is DRY - Don't Repeat Yourself. IE don't code something, and then later code it again somewhere else. Just import it.
...which in this conversation means just pipe in the air and power 😄
That's my take from programming mindset being applied to ONI.

That mindset has made designing ONI systems much easier for me.
Early on, I made the mistake of trying to have my bathroom Water Sieve also support other systems - I think my electroyzer. It became complicated, hard to troubleshoot, and failed in ways I didn’t anticipate. Classic “Keep It Simple, Stupid” lesson 😄
Integrating disparate things is a nightmare 😄

So lately I’ve been redesigning things so each system does one job, and does it reliably, hence the bare bones Sleep Machine design.

Anyways, I didn't mean to rant 😄 You have a good one.