When I was designing mine, I found this post which is known as the Enclosure Zoo. Lots of good pictures and ideas in there.
You’re getting lots of good advice here, especially with the height. I would also suggest leaving a slot/hole in the back of the enclosure (that can be plugged/capped). No matter what Shapeoko you have it is basically unlimited in size on the Y axis as you can “tile” large projects. Take a look at what @MarkDGaal accomplished.