From what I understand Einstein was the person who decided length contraction would indeed occur in the vector of velocity, more so as you approach c. If it were possible to accelerate a particle to c, would the length would become 0? If the length were to become zero, would the notion of mass become 0 as well? Also, if the passage of time does tend to reach 0 at c and z becomes 0 would it not make sense that x and y would scale proportionally as well? I'm not positive of the proper terminology but looking at the spin foam models it would be like the tetrahedral 4 dimensional "imagined" shape where you are in the point in the center and the time points behind your direction of travel and the face triangle would be perpendicular to your velocity vector and the x,y,z would depict your "view" of space. Is any of this supported by accepted theories?