I find attaching the print to foamcore with a window over that to be a bit on the cheap side. Foamcore is so easily damaged that it does not come off as a quality permanent presentation. Perhaps fine for art fairs.
....and it is fine for my living room. If I was dry mounting it, I would use a museum board and hinge that to the form core board. In fact, the one I sold (and the only one I sold), I did it that way.