My plans I have for building shed homes make your dreams of living tiny both easy and affordable. All plans come with the following:
Build and design your floor plan any way you wish, add a small kitchen, bathroom with shower and toilet, and nice sleeping areas in the loft or first floor. Add or remove doors and windows and place anywhere you want with detailed information on this in the building guide.
These plans show wooden floors but are easily adaptable to building on a same size slab.