Another category of changes involves "M" numbers. As previously noted, the M number is the internal project identifier. Sometimes they correspond to the Type number (M100 is the Type 100 Elan, M111 is the Type 111 Elise) and sometimes they don't (M50 is the Type 75 Elite, M52 is the Type 76 Eclat, M70 is the Type 79 Esprit).

In general, M numbers are not chassis/product numbers (per your definition) and shouldn't be listed. I suggest changing Type M111, Type M117, Type M121 in the chassis/product list to Type 111, Type 117, Type 121.

Also, there appears to be a typo related to this. "Typ M117" (http://www.imcdb.org/vehicles.php?make=Lotus&model=Typ+M117&modelMatch=2&modelInclChassis=- on) was probably intended to be "Type M117" and I suggest it be changed as indicated above.

There are exceptions.

- M100 (Type 100 Elan). It is widely known as the M100 Elan, probably to distinguish it from the classic 60s Elan. However, I can't find any references to M100 Elan in any Lotus promotional material on the car.

I suggest changing the chassis/product from Type M100 to Type 100. I suggest changing the Elan model entries that refer to Type 100 Elans to "M100 Elan".

- M250. This was intended to fit between the Elise and the Esprit. One-sheet product specs and other promotional material was produced in (relative) volume. Hot Wheels made a toy version. And then the project was suddenly cancelled. It got a Type number (118), but never got a name.