Wow, you're good! How did you find those passenger lists? I'm not very good at this and to be honest I'd probably rather poke my eyes out with a stick.
We are doing well with George though.
It certainly does seem as though we've found the right George.
You've found that he was in England in the 1841 census and not there in the 1851 census.
The time period of around 20 years the neighbour stated that George had left his family at Port MacDonnell prior to his death in 1889 matches George's last known whereabouts of 1870. Also, Ellen remarried in 1890 when she must have been sure he'd died. The neighbour also stated that George said he was born or was from Derby, England and he arrived in Australia in 1850.
The only things that don't match are his age on his marriage certificate and his birth year
The story of sailing his father's boat out from England and selling the cargo is odd, but he did have money to buy the land and build the farmhouse (Dingley Dell), which would be hard to save on a labourer's income. If I had capital of some type I would keep it intact to purchase something worthwhile rather than live off it so this may explain why he was working.
Have I forgotten anything?
After what I've looked at over the last week or so, I can certainly understand that it took 15 years for you to build your tree. I've had my notes, certificates etc for years and only just started looking at them because after my brother died in 2014 his grandson (12 at the time) wanted to know the family history. I promised the boy's father (my nephew) that there was no family tree, but if they were ever up this way they could photocopy what they wanted. Well, my nephew is coming up this way in July so I thought I'd put something together for him - sometimes I'm just too kind!!!