Clyde in Montana ! He makes these slotted holders in maple, oak and walnut. The workmanship is wonderful! He has both the table top or wall mounted styles. He also does custom finishes.
I asked him to paint mine white instead of staining the wood. It arrived today and it is so nice! Fourteen slots for rulers. Eight hooks for hanging, and the small front door opens up for storage as well. He even provided the screws for hanging.
This is a similar picture of what mine looks like. I'll be hanging it once the sewing room remodel is finished. I'm so excited to have found this!