My best guess is will be around 4.5c - 5c for either, or both of...

My best guess is will be around 4.5c - 5c for either, or both of two reasons:
(a) NPAT will likely drop quite significantly in the second half
(b) Directors are prone to pay a dividend that is not always directly related to the NPAT, rather the share price. That is to say that even if NPAT would support a lumpy dividend they are likely to scale it back to a level that will still keep punters happy. Using the rest to pay down debt -not a real bad strategy.