To get rid of the blimp (eating into the Castle Nugget parking building) there are 2 solutions:
1) Set graphics to normal or sparse
2) Place this NOBLIMP.POD on top of the pod.ini 
   and the blimp will be gone. 
   In fact it's still there, but invisible and silenced: the ~300 vertices of the original blimp will no longer impact performance.

The model fix has been made by Malibu350 and included in the POD of his track "Toys in the Attic".
This file also removes the blimps' engine sound.