Features:
- Scales in X & Y
- Leaves space for roboports
- 5 repeated slices will consume a green belt (assuming no modules other than efficiency)
- Keeps small internal reserve of heavy & light oil
But keep in mind:
- Reasonably balanced, but not perfectly. A little bottlenecked in light-to-petrol, but that just means you can tap off a bit for rocket fuel & lube.
- Not self-bootstrapping. Needs a little bit of heavy oil from simple coal liquefaction to get started. Slices will bootstrap their neighbors though.
- Made for Vulcanus, using steam as input (from acid neutralization). Probably not ideal for Vanilla/Nauvis.