I acquired some older equipment and noticed that one of the bottom boards was made with the standard 3/4 inch hieght in the front and the boards ran a tapered slant to 1/4 inch in the back. No matter if you flipped it over it seemed to be the same on the other side. I like the concept since propping up the back with a piece of would is not needed if on a level surface.

Is this homemade? Anybody seen one like this? Any pro/con issues. Seems like a great thing but than I ask myself why don't I see more of this.