Take a good look at the upper deck of the 91 car, the edge of the graphite was so well polished. Just an excellent example of super well made, hand made car. excellent craftmanship.
If you watch the other video '1989 IFMAR off road world championships Australia' on youtube, near the end you will see Mr. E. Moore from MIP handling a 4wd rc10 on the bench.
The interesting point is that this 4wd RC10 is VERY different from the other MIP modified 4wd rc10. This one the belt is in the middle, not off to the side. And, it seems that the the top part of the belt is above the batteries but the lower part of the belt pass through under the length of the battery!!!