That looks really nice. A forkie will be out there tonight to shine up those trunks for you!
I'd recommend adding a couple of steel T-posts to mark the rows as well. It will help reduce the likelihood of the township ditch mowing crew or the farmer's sprayer from hitting your trees.
I once lost a couple hundred trees when my farmer renter accidently sprayed a section of my visual screen, but that was when I only used short wood lathes to mark the row. I've also had snowmobiles, atv's and trucks run over trees that I planted when they were small and hard to see. Steel fenceposts took care of both of those issues.