After a discussion with Mark Lemon, I decided that the model would be greatly improved by adding the buildings around the compound. I increased the ground object to cover the area to the east of the river and including a portion of San Antonio de Bexar. Based on information from Google Earth, I approximated the topography on the plane. Simple building objects were placed based on the map in Mark’s book and I increased the detail on a model that I had started for the San Fernando Church. These buildings will only be seen from a distance and I should be able to use a low resolution texture for them.
Here is a snapshot of the buildings of Bexar as seen from the Alamo (without the textures).