
A useful and simple tool used to develop my concept farm in 3D is Google SketchUp. I have gone through many versions and iterations. The final design is a 3 storey farm house with roof pools to collect solar energy using it to create humidity within.
The open roof shows the roving room and inter-floor entry hole. Left of picture shows the internal columns & staircase - simple isn't it?

I'll build it over water - that takes care of many pest problems + added security.

Another perspective - a farm shed & garage by the side where I intend to house a standby generator in event of power failure.

I did all these in actual dimensions and placed on site (taken from Google Earth) - before committing a single dollar! It certainly helps a lot in planning process and avoid costly mistakes. Such is the power of IT - and all for free!
Thanks Google!