Indeed- 47mm is way too large for my wrist as well. The 45mm Radiomir is my max, and it's tolerable only because the case has a very low profile design to it.
I am not sure if Kenzo is selling these custom made Radiomirs any longer. At $550 per, these were great bargains for a custom made Swiss 6497 based time piece. I think I spent more in collecting parts for mine than what it would have cost to just buy one of his creations. It was, however, a lot of fun putting it together