Earthship greywater systems

After reading three Earthship books, I am curious what other permies think of them; particularly the indoor swamp/grey water tank which fully contains and uses the house's greywater indoors.

Has anybody done this, or seen this, or have any thoughts on this at all?

They seem to work well in the arid climates that earthships were developed; but I don't know how well the humidity in a cold and/or wet climate would translate. If I lived in the NW, I would prefer to run my grey water outside for filtration and pipe in what I needed for growing in the solarium what and when I needed. But as a primary support system, I would hesitate to keep it indoors in all climates.

The reason that I'm considering it is that I have a substantially cold winter season, where it can get 40 degrees Celicius below freezing. I do not necessarily want to heat an external building just for my grey water treatment, but I also do not necessarily want to have a jungle in my living room if it's going to be an issue with moisture levels in my home.

The other option that I'm considering is using a couple of those square metal caged plastic fluid containers (4 foot cubed, I think), buried underground 5 feet or so and filled with mulch/fungi, and worms. The grey water would flow into and through one, and then into the next, before going into the ground water system (or possibly with the additional step of a dumping in the middle of a deep hugulkulture trench downslope).