Have a 20 X 45" needlepoint to be stretched. Need suggestions on what to stretch it on. The needlepoint board we normally use doesn't come oversize. Did a search and the closest thing I found was "Framing Oversise Crossstitch" where they were using foamcore. We need something beefier for this guy. One of our suppliers suggested 1/2" gatorboard and stapling the needlepoint canvas to the back. Opinions on using gatorboard for this or other options are greatly appreciated.