Jeff Jackson

Made a new save, no longer 20 blocks up in a tree, haven't played with it.  Sorry!

With Iron I was able to work the outer edge voxels *back up* onto the iron piece with my hammer, thus enabling me to finish my first iron ingot by hand.
I don't have a windmill or helve hammer, but after hours of work have a single iron ingot!   

@RhyagelleI hoped someone would get a kick out of it!

I've been murdered twice by the same tree now.  Just hanging out building a tree house, and suddenly half my health is gone!  Turns out the new *awesome* wavey affect actually moves the tree branch hit box and can *squish* you quite violently... 
(I've been crouched, hanging off the end of an unmoving block both times, if it matters)