Hi, I'm new to land speed racing, so I've got some basic questions. I am going to build a car to run in the altered class. The rule book says all panels must be in the original relationship, but allows an engine set back. How much of the firewall and floorboard can be removed or modified. I plan to construct a full frame and roll cage for this car, but I want it to be completely legal. Is it acceptable to remove the floor and firewall and replace it with new sheet metal? Thanks for the advise, Brad Thomas