just look at there website, the site itself might not be too fancy, but from what i can tell the plans are prob superb! i'm tempted to build the 2 seater, watch some of the vids.
p.s. does spider carts have any vids of the arachnid going off jumps, not to mention a kart with no suspension, being fine with it? i would buy them, even if they are crap, its only 20 bucks. i like how your willing to buy plans.