I fitted the body to the frame as indicated in the manual: secured to the firewall, raised the rear until distance was 45.5inches etc. and did the firewall notch as others have indicated. After I fitted the doors I noticed that you can see a small portion of the frame at the rear end of the body, just in front of the wheel wells. Is this normal or is the body supposed to tuck under that portion? The picture below is the portion of the frame you can see (green is the frame, and red is the body)

Frame v2.jpgFrame.jpg