Glad you like the tree. Final height 1-2” more. Leader wired up to thicken, will put one more wiggle to left and cut down. Here is picture of base and nebari to answer you second question. Nebari spread is a bit greater, planted a bit lower than final this year to help develop nebari, partially covered with sphagnum.
As a last comment, want to place some root grafts, particularly at back. Hard to find arakawa rooted cuttings or seedlings. Trying to grow some of my own this year to place in future. Should one wish for the same arakawa bark on root grafts, need to make sure stock is arakawa.