It wasn't until after the build that I decided to combine features from both houses, and make a new design out of the two in Google Sketchup. If you're thinking about building a small house, I would recommend spending a few hours to learn Sketchup, and doing a design on the computer. The arithmetic is much easier.
Here is a model that shows the frame of the new design, with features cribbed from both builds.
Here is another model of the same design that includes interior and exterior sheathing.