Is Schapelle Corby Guilty?

Much of Australia (including myself) will have been glued to Channel Nine during the last couple of days to watch the 5 hour coverage of the Schapelle Corby Case formatted for television into an infotainment type mini series.
Up until now I have never formed an opinion as to whether I think Schapelle guilty or innocent.
The Corby family does certainly seem to be what some Australians might call 'rough and hardened sorts'. Someone told me that the father (or is it stepfather)? was a bikie; he looks and acts like he may have been? The whole family seem to be pretty rough sorts - and I'm sure there'll be many who might condemn them for this fact alone.
One of the brothers is a surfie; who claims he doesn't take drugs - nor has ever been exposed to them. In fact the whole family seem to be denying ever using or being exposed to drugs.
I find this extremely unlikely. Particularly in this day and age in Australia. And this family also seem to be from sub-cultures where a far higher exposure to drugs would be the norm.
I would imagine that all of them would be 'drug savvy' and would have met many, many people who regularly take drugs and probably most of them themselves would have had the odd toke or two or much, much more.
They don't really seem like what many Australians would call 'nice', decent, happy or honest types - but does this mean that Schapelle is automatically guilty of knowingly transporting 4.2 kg of marijuana in her boogie board?

What about the accusations made about certain baggage handlers?
There certainly appeared to be some big gaps in airport security that I'm sure might allow transfer of drugs interstate or internationally to be non too difficult. Though these may now have been addressed more by the addition of extra security measures.
Convicted South Australian Drug Lord (MaCauley) might know more about this sort of smugglers network but how much he may choose to disclose in his attempt at a lesser sentence is an entirely different matter.