Actually it would be very different to run a sewer to this house than to a traditional house.
When you are piping large amounts of raw sewage around you need strict rules to protect people, property and the environment. So now you need to get it up to code, and pay trained people to check that it complies.
Straw is a promising material but I think we've already tried harvesting logs in "large quantities" and it hasn't worked out perfectly.
As I said, I have people in my family who have built strawbale houses to code (California code including earthquake provisions, no less). The stylized aspect is distinct from the strawbale and inset-in-land aspect.
Regarding logs, I'm currently sitting in a house with wood framing in the suburbs, and every house around me as far as I can see is also framed with wood.
When you are piping large amounts of raw sewage around you need strict rules to protect people, property and the environment. So now you need to get it up to code, and pay trained people to check that it complies.
Straw is a promising material but I think we've already tried harvesting logs in "large quantities" and it hasn't worked out perfectly.