Hi kent man, go to electric cars, bugies and truggies forum look for truck conversion,its an rc truck converted using tank parts, iam working on the mattraks idea for my savage 21,using heg long parts , i have all the important detailed pictures just have to make the triangular plate to fit the idler wheels and tracks, i wrote to mattracks but they wernt interested, and the shack truck is crap,
Watch this space.
heres a picture of the tracks

Rick.