I like the idea of a walled village and this is a nice example - although somewhat underpopulated.
Perhaps it is a scene during a period when the plague was rampant and no one was outdoors ... (this idea came from the fact that my son was just singing "ring around the rosie" yesterday, which was originallly a song about the plague - pocket full of posie = plague spots).
I think using a thin wall would be realistic because of the lack of resources in a village. I would also think that the whole village might not have the same coloured building and rooves, depending on when they were built and by whom.
I have a lack of doors as well but do have an abundance of these :'Boat Base Bow Plate 6 x 7' (2625). http://www.peeron.com/inv/parts/2625?img=10640
If you turn them on their side and add 3 tiles as banding they can pass for a door behind the HP Door Frame: 40242
Use a Modified Plate, (2540) at the base for the door side of the hinge and 3 Plate 1 x 1 with Clip Vertical 4085 with 1x rounds in between as the frame , you can get a passable small door. you need to make the hinge solid in whatever is around the door but it works well. I would post pictures but my wife and son took the camera with them to Mexico - perhaps when they return. email me if this is unclear
I have yet to try this door behind a constructed doorway, but think it would do the job as well.