And as such, let me tell you... doors should be 2 wide. 1 high doors look ugly, and the 9x9 is stuck with those if one doesn't want it off center, and for a person with OCD(a strong majority of Minecraft players I'm quite sure), that will drive us mad.
I used to do this a lot, but I'm slowly trying to get away from it, mostly with 3 being the magic number, really, I should say 2 is the magic number, with 3 being used as a measuring stick through what I'm making, so I can make sections of any shape, which will lead to me being able to use walls for either 1 or 2 doors in any given section, depending on what feels right.
OCD is a strange thing, and so is Minecraft. The two were all but made for each other. But a aesthetically pleasing house need not be inefficient. And geometry makes a beautiful house efficient and often does so in strange ways. Take the honeycomb. Hexagonal. Bees are clever. They honeycomb is all the proof one needs of this. I'm trying to think of ways to make hexagonal houses that are quick to build yet smart. Need doors that work on hexagonal angles I fear. But other then that, I can make my new housing style. And bees are wise enough to show us how.
I've thought about this, then I can't back to the ugly reality of Minecrash (I have bad history with this games stability), and that a diagonal wall isn't that effective, nor is it anything pretty, but that doesn't mean an Octagon can't be used. I've used Octagons to great success, they're very versatile to use, especially in my measuring type, since they're that round shape, you can make nice looking towers from them, and many other things, even if you place one on it's side, you can make a tunnel that looks like a pipe, given the right blocks, mostly steps and slabs, Octagons and this game are a winning combination, Strangely, so are Triangles, at long as there is the main face is the point of entry, and not the point. You could make Hexagons in the same way, but making an entry way at the point would be a nightmare to make look nice, unless, you make the hexagons on their sides, would I think I'll go test out some, but in the end, it's shape is going to resemble that of an uneven Octagon,