This book details the design for a smaller living space. You can adjust the plans to meet your desires and needs. If this book says to do something one way and you want to do it another way, investigate how to do it another way and then do it that way. Hopefully this idea will encourage your own ideas. And, hopefully, it will more than halve the carbon footprint of a typical home in the US.
Five thousand sq ft may sound like a lot of space, until you realize we're talking about land area and that 10,000 sq ft is the typical size of a city residential lot. Ten thousand sq ft is a little less than a quarter acre. So, 5,000 sq ft would be half that much or about a tenth of an acre. Since we're reducing the land area by half, we should also reduce the house and the car by half. The Not So Big House reduced houses to about 2,000 sq ft. In this project, we will go even further, reducing the house to 500 sq ft.