I made this quite some ago, shortly after Lego brought out their Technic Power Functions Dozer, great model. I first posted my creation on the Lego site and called it David and Goliath. My dozer sat next to Lego's in the photos I took.
Not long after, Lego came out with their City Dozer which I also bought and built. Their kit was #7685. If you compare the two when it comes to size, their's is bigger of course, yet both are mini-figure compatible. If you compare the two when it comes to play ability, mine wins hands down, you can actually drop it on the floor and it simply refuses to fall apart.