We're currently implementing a 0.5 Ha SAF system, and just happen to be hosting a course on it this weekend. My wife & I did a PDC with Geoff Lawton a few years ago, acquired some land, did a SAF course, were blown away by the health and abundance of a young system nearby....  we knew we had to do the same.  We're also in the sub-tropics, but a little colder than you. Were get a couple of weeks of light frost in mid winter.