SplinterGroup.... good points about floating the board within the moulding. Definitely something to think about.
I did not do this and took a risk that with each square being glued to each other and the frame glued on to board as well as underneath there's a beautiful finished plywood substrate where the entire surface is bonded to board ..... I very much doubt there will be any issue. Especially inside the house. It's actually light to pick up and very solid. Time will tell.