Hmm... The stage plan manipulation looks spot on for the "Assignment: Earth" setup, save for the minor detail that the transporter control console in the blueprint is at a 45 degree angle with the radial corridor, while the console in the episode is at a 90 degree angle to the corridor. That is, the wall angles look completely correct.
Whether the dimensions of the wall sections are off is another matter. If each segment were a tad shorter than suggested in the blueprint, the protruding might yet be avoided... But again the drawing looks like a good approximation of the dimensions we see in the episode.