why not? you can do it, and who cares if it's already been done.
You can make yours better....maybe add a tabletop grill, a small keg of beer under the table with a tapper coming out of the table top, smaller better looking tires (lawntractor or golf cart style), a better looking picnik table (that one looks pretty beat up), maybe an umbrella in the center of the table to shade you from the sun.
A better steering set up with a steering wheel or motorcycle handlebars rather than the tiller type thing that he's using. Maybe set up a lawnchair behind the table facing forward for the driver. with a steering wheel or handlebars coming all the way back, hidden under the table top.
heck, you could even add a cooler under the table, and you could have a traveling picnik table with everything you need attached to it.
the possibilities are endless when you put your mind to it, and it could be quite entertaining.