Mark,
This is great. Thank you.
There may be a small quibble with the line for the Plus 4 interim-cowled cars. These were only used for the 1954 model year and began about Oct 1953. These interim grilles were only used for a few months, and by summer 1954 the Plus Fours had the full waterfall grilles. According to Mahlon Kelly there were only 25 interim grilles manufactured and he found the last one in the spares department in the late sixties.
Thus, unless you have some different information, you may want to show a shorter timeline for the interin-cowled Morgans.
