I have final weight bias numbers for you. These numbers are ready to run with the body (no paint yet). Total weight is 1541g, Front 564g, Rear 977. That's a bias of 36.6% front to 63.4% rear. That's a heavier rear bias than I had with my rear motor setup! On asphalt I can't keep the front end on the ground so that should (with any luck) translate to forward traction on dirt.

Oh yah! That's without a brass weight hanging off the back.

Now I just have to get to the track.