Charles, when running the Merkur I did push the envelope a little in Production Supercharged, but didn't have the guts to do that body work when we repainted.
I did glue the door shut with clear RTV but did not fill completely to give impression of streamlining.
Later I ran the same body in GC and Altered with a N/A motor, but left that part of the body alone.
I agree, it would look really slick though.