For anyone wanting to make their own. I used
Studio Décor® Platinum Collection Frame, Black - Black - 24"x36"
http://www.michaels.com/studio-decor...-size&start=12
IMPERIAL 24-in x 3-ft Sheet Metal
https://www.lowes.com/pd/IMPERIAL-24...-Metal/3234805
The sheet metal fits perfectly inside the frame. The frame is sturdy enough to hold about 20-30 pounds of magnets. Of course I used
molly bolts to hang the frame so that the screws in the wall could hold the weight of the frame.
I'm thinking we'll need to start a second one in a year or so!