If its working, it much further ahead yeah.
This won't work, at least not the way it's supposed to:
if ($sStatus == 01). It *will* work because of PHP's datatype weakness, but it won't work logically since you are comparing a string '01' to octal 01. With the datatype weakness this compares 1 to 1. I'd suggest keeping them as string comparisons though.
I'd also still use the is_file check, but provide a hard coded alternative path for just in case it cannot find the file you have specified.
header('HTTP/1.1 420 Enhance Your Calm');