Mounting the grinder and woulverine tracks on 3/4" plywood gives the flexibility to try different heights, benches, and carts. etc. find what works best for you. Also sharpening styles can change over time. When I used to hand sharpen the Ellsworth grind on a platform I liked the center of the grinder wheel just below eye level. This gave me a good sight line and a control of the tool. Using the Ellsworth jig I like the center of the grinder wheel a little above my waist. This is also a great height for me to hand sharpen spindle gouges as I rest the hand holding the Handel,on the top of my thigh.