K.F.
We actually built a guesthouse based on some of the principals in those books. The result was a gorgeous, custom cottage (900 sq. ft.) that maximizes space and has the feeling of a much larger home.
Custom cabinetry is not cheap. The built ins we did are beautiful and really give the house a high end look but I shudder to think of what they'd cost in a larger family sized home. Are you building for your family or truly a "not so big" house?
We wanted a small guesthouse with a minimal footprint as to not disturb the surrounding woods or take away from the views in our family home nearby. If you're building more than a two bedroom you might not find some of the ideas helpful. Also be careful of catering to your own needs too much. Energy efficient and green is always good but custom storage and built ins do not leave a lot of room for another home buyer to make their mark on the house. Good luck!