Not hollow at all Eddie: John (hi there John) tried to "tickle the tiger", as the first atomic scientists said, and lost his bet - but man, that thing was fast! You stayed within the design parameters and earned the victory (over me and Joel if I remember right...).
Your car worked very well, and had decent speed for a 13D; the motor is why I got them confused.
In any case, the Lotus 30 has got to be the most commonly used body in slot racing, especially if you include the 40...
Don