Nice. I first did that 25 years ago. Only I use a couple broken rake or broom handles. Maybe no need to have them that thick, as it means a crowbar is needed to lift the section to fit the dowels in. But they really roll easily, which then allows a lot of lateral movement to be gained, if needed, say, if the tree is inside a deck, as a few I've done have been.
A premier Brit arborist, Reg Coates, has designed a complex tool called the "Block Driver" that allows him to mechanically tip big wood over and off. Check him out at YouTube. http://www.youtube.c om/profile?user=Reco ates#g/u Awesome videos, but I didn't find the Blockdriver featured.
I have a bunch as well http://www.youtube.c om/user/rbtree
Join us at treebuzz.com and masterblaster.com, two great forums.