Looks good. Just wondering.... the plates at the bottom of the legs don't look very long/wide. Have you considered going bigger on those?
How tall are the legs? Some jacks don't go as high as others. Might be something for people to consider if they order it from you. You should put it in the "for sale" area if you already haven't for those interested....if you plan on making/selling them.
Also...how wide is the adapter? The jack I had originally had pads that barely fit across the adapter that Larry made. I went with a jack with much longer pads so I have about 2" extending beyond the adapter (makes less me less nervous when lifting the bike !)