Hi to all!
I also think that this Model B is one of the best Models type B in whole technic history.
But back side is not good and seems like not real. Cabin is not suitable for technic figure. And motors for tracks is not stabilized. So I found solution how to keep tracks still bend but with additional mount for motors.
https://yadi.sk/i/GjukFo61F6LkAA
https://yadi.sk/i/mYgJqo4Fffx9qQ
https://yadi.sk/i/2lr-8uaqS8i8YQ
https://yadi.sk/i/YbwH0Xk5ylYRqw