For posterity's sake - since the Craigslist ad won't last forever...
Seems pretty well done, as far as a small, distant pic can show. Like Paul says, be nice to see more detail.
OTOH, for a sand rig, it seems it would be a little tall. I've seen sand quads before with liter-bike motors shoehorned into quad frames. Also in custom made sand drag frames that are long and low. Still, it seems Banshee's are the most popular choice for sand dragging.