I looked this site up on a whim -- I am also a direct descendent, through his youngest daughter, Margaret. All five of her children migrated either to Australia or NZ -- my grandfather to NZ in 1923. So am on the same rung of the generational ladder as you. Born in NZ, I now reside in QLD -- some years back I read through the (extremely curious) probate records of the Public Trust (tell me, is the pocket watch still in the family?!), and have visited his grave up in Strathpine. I am curious to hear of what (and who) you have found -- easier to reach me directly: a.leach[at]griffith.edu.au.
I look forward to hearing from you,