when i was playing on Al Basrah i found that when building a hide out you can slip inside it through the back part very easily and this could be very cheap since yu could hide and not be seen very easily.
i think to fix this all you would need to do (i know u know how to fix it since u mad ethe mod just like to give my two cents worth )
is place a undrawn wall at the back of it to cover the back and that sould fix it right up.