Another thing to bear in mind is that that toy doesn't have 4 wheel drive like the real Tornado did. The four wheels you see on top there are static, they don't move. The actual drive wheels (if I remember correctly) are where the rear wheels would normally touch the floor, and steering is car-style rather than tank.

Whatever class you're planning on competing in, you'd be better off building from scratch. If it's a Tornado you want, it should be easy enough to make it a replica. If not, building from scratch will just give you a much better machine to fight with.