HANY I'm sorry but Mac OS X 10.3 features ipfw version 1 which lacks many options compared to ipfw version 2 found in Tiger. Mac OS X 10.3 is old and the applescript subsystem is not as stable as for Mac OS X 10.4. And anyway it is not suitable for WaterRoof.
For these reasons the minumum requirements for WaterRoof is Mac OS X 10.4.
(Version 1.8)