I matched obstructions to the edges of the buildings and made footprints +2m from that.
There's more 3x3 corrals than 2x4, so I changed the default to be square.
Removed the footprint height since I believe it's obsolete.

Check that all the footprints, obstructions, foundations, and rubble look okay. (Note that there is no 2x4 rubble, so 2x4 foundations use 3x3 rubble for now.)
You can use the demo map from D710 to help test. Add the line

	if (template.indexOf("_corral") == -1)
		continue;