Here is what has resulted from one year of growth:
Clearly some good growth and fusing occurred here. The amount of fusing is consistent around the lower part of the tree. Some of the seedlings didn’t make it; if I had to guess, I’d say maybe 5 or 6 didn’t wake up from dormancy, and the same number perished during the year.
I was surprised by the amount of swelling caused by the twist-tie wire “tourniquets,” though using wire to swell trunks at their bases (and grow horizontal roots) is a common technique. I guess I was thinking that thin twist-tie wire wouldn’t cause them to this degree. In any case, with more mature examples by Doug Philips these bulges appear to subside as the trunks grows in diameter, so I’m not too worried about it.