I still haven’t attached the border! Went back on the whole plan today too- I  decided to change the plinth I wanted it on, putting it on the eggshell coloured one instead of the other two. The height of that plinth felt at a much more realistic level to that of border in a home setting. I also played around with the level at which I wanted it. I want the white wood to show through as I feel that is a success of the piece. So I think I prefer the middle image of the three here.