I am now working on developing a workflow for texturing the model.
I researched tools for generating normal and specular maps from texture photos. In consideration: ShaderMap, CrazyBump and PixPlant2. Initial tests favored CrazyBump but this was due to a limitation in the ShaderMap demo. I purchased a ShaderMap license ($20) and seem to get good results now. PixPlant2 is pricey ($175) but may give slightly better results and also has a nice texture seem removal feature.
I believe that a texture resolution of 128 pixels/m will give good detail for most objects. So, I am going to texture objects at a maximum resolution of 256 pixels/m unless the map exceeds 4096 pixels on a side. Then, drop down to 128 pixels/m.
I unwrapped part of the convento and the granary.
Since the granary is relatively simple, I will work on this first.