eleanor burns has this
http://www.quiltinaday.com/freepattern/
page down and look for "how to make a sewing table from a farm table", click that and you get a pdf instruction sheet that you can print out.
somewhere in her videos they show how to do it but i don't know which video it is. you would have to search through them to find it or contact their store.
the video is in the Rainbow Floral series of videos. "Designing a sewing studio"