Aspects of 'fortify' to consider:
1. Get off your property and figure out how you would attack it: from where, in which direction, using what cover and concealment, and using what method of attack. Get down on your belly behind bushes and trees at the limit of vision so that you can see what an attacker would see.
2. Unobvious as to the valuables inside and the defenses. The nature of defenses should become clear only after an attacker is committed.
3. It should be difficult for a passer-by to determine how many people are present or how many routinely live there.
4. Well protected against fire, both natural and man-made. Flame proof construction is a start. Substantial fire suppression equipment should also be present, or at least many buckets of dirt.
5. Natural barriers to foot-intruders are less obvious than fences and barb wire. Pyrocanthia (firethorn) grows into a fearsome 'living barb wire' shrub. Other plants have the same capability.
4. Ordinary looking terrain features, such as drainage ditches or a row of sturdy trees, should preclude approach by vehicle except by the driveway. It should be impossible to ram the house with a vehicle, even a 4WD or large truck.
6. Dogs can be eliminated with poisen meat. Pens of geese were used as guard animals at night by the Roman Legions. Maybe a mixture of the two might work.
