Great day… I received my 3×3″ wood cutouts in the mail.  These are surprisingly light and seem to be pretty uniform in size.  Thickness is not as uniform as I was expecting but I’m not sure that matters.  There are several online vendors who can create these types of wood cutouts and I went with the cheapest one first.   My only concern here is that the edges are rounded.  I think I’m going to have to try squared corners before really buying these in bulk.