In the book “Standard Catalog of AMERICAN CARS 1946-1975â€, models are listed chronologically. After the all-new 1949 Mercury, the following description appears for the 1950 model:
“For 1950, the letters of the word MERCURY were embedded in chrome on the front of the hood. The signal lights were chrome encased, in a fashion similar to that used on the 1948 Cadillac. The design of the trunk chrome was altered, as was the tip on the side spear. The biggest change was made to the dash, it was completely restyled.â€
It sounds like you could do a custom 1950 Merc from either the AMT or Revell ’49 Merc.
Note bullit holes in the trunk: