Great pictures, thanks.
If anyone fancies a challenge (

and it is a challenge), I've got some some nice layouts for various locations we might need. Here they are:
I've also created a gallery of inspirational pictures
here. (have a dig through - the better pictures are nearer the end, because I uploaded them first.

)
Now, most of this will need new models. All different textures will have to be separate objects. It would probably be best to make them modularly, so pieces can be reused.
There's no hard poly limit, but keep in mind that an average town house in native is about 1500 polys in total.
The interiors can be separate models.
These structures are intended to be self-contained, self sufficient, highly defensible buildings. The dark woods are dangerous, especially at night-time.

As such, they might have the odd section of rampart too.
Higher resolution pictures are available on request.