Gday Nath,
Firstly, your numbering idea is fantastic, maybe we could get Jack to help compile a timeline of greenfields early years? there is defiantly a lack of documented history.
I do have a few considerations for your list:
My early HD8 has a Fuji and a 25" deck which would make it a 2.05 on your list,
The dog clutch your refer to in 1.4 also featured on the turbo-chute decks on the earliest red models,
Steel deck? (1.45) I am happy to stand corrected but I have never seen a red greenfield with a steel deck,
Mark 2.3, somewhere in this evolution bonnet louvers were introduced.
Regarding Fxxxrr's machine, another slight difference is that It has a rear frame fabricated from square tube where as mine is round tube.
Cheers
Greenfielder