First of all, you need to choose an empty field-template from the agricultural industry spec in the asset editor. Of course you can add an earthship or greenhouse to any existing asset (mostly residentials) that features enough free space for it.


Once your plot is laid out, go to the 'residential props' tab and look for 'rooftop accesses'. Choose a slanted window to your liking. -I found the ones with the white frame to work very well together with other props and building-colours, but if you want a more "shabby" look you can also take the darker framed windows.
When you put them on the ground, make sure they overlap ever so slightly (see below), otherwise they become separated on uneven terrain. And we don't want that, since neither humans nor sensitive plants like to be exposed or rained on, especially in a colder climate or if there is a chance for plants to catch rot-disease from splashing-up soil-sprinkles!

When you're done with placing the windows, go to the industry props tab and put down a cargo-container in the 'back' of the windows. If this is supposed to be an earthship for living, the inhabitants need some space to move about. This is also important for adding septic tanks, where we will get to in a second.


After the container is plopped, some septic-tank modules are needed... Humans regularly need to relieve themselves and plants can take advantage of that. And no-one likes to drink poop-water, as all CSL-players hopefully have learned by now!
So, go back to residential rooftop accesses and choose the "rooftop entry #1" (that grey concrete emergency-door with the slanted backside). Turn it around until the door is facing the container. Now repeat the same overlapping procedure as with the windows. -As the height of container and emergency-door is about the same, you might see some artifacts when scrolling or rotating the view. That can't be helped, but there are alternatives you will be introduced to at the end of this guide. So far, the container was the only possibility I found to overcome the bigger height-difference between emergency-door and rooftop-windows, there would be a visible gap between them without the container.

Having finished the 'body' of your earthship, add an entrance to your liking on one head-side and some more windows on the opposite end.
You can either set them at an angle (45°) to create an illusion of a more smooth passage:
Or you can 'camouflage' the corners with some medium or big solarpanels, which fits the self-sufficient theme of an earthship very well:

If you don't want any human residents in your earthship and only need it for horticultural purposes, you can skip the container + septic tanks and just add a second row of windows looking into the opposite direction of the first row. The rest is just the same as with septic-tank and container. This is how you get an UFO-greenhouse of any size that you can still fit into the limit of 64 props per plot:

Now your earthship or UFO-greenhouse is finished and you can fill up the rest of the plot with crops and/or decorative plants. You can group some plants together to make it look like a proper allotment, or just mix them if you want a more natural, ecological food-forest touch. (A guide for designing an ecologically sound plot will follow soon).

Et voilà, your earthship-farm is ready for growing in your agricultural district!
-> the asset shown can be found here: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=428955189
And to show that I'm not making this up, see how earthships are built IRL:
cheers, Forestfey

-tag-image courtesy to Dominic Alves' image of the Brighton-Earthship in East-Sussex, England-