I wonder if there are similar projects to get more ideas.

Oh there are. Just search for "eco project", "tiny house community", and terms alike and you will find many real life projects that can give you not only ideas but also insight in all kinds of problems they had to solve. Basically it is not the physical setup that is a problem (i.e. terrain, houses, gardens, etc.) but the whole circus around permits and other governmental obstructions.
For the building part Sweet Home 3D is excellent. I'm sure there are multiple members that are willing to help you achieve that part of your project.
If you have more specific details for one the parts I can see if I can create something for you.