OK then let me see if I can get this right.
As well as the other differences mentioned above here are some other pictures of the different bits.
Catcher Flaps
Mark I
[Linked Image]
Mark II
[Linked Image]
Thottle control
Mark I
[Linked Image]
Mark II
[Linked Image]
Bottom part of handles to base.
Mark I
[Linked Image]
Mark II
[Linked Image]
The only other different's which I don't have a picture of is the Mark II had the plastic fuel bowl.You will see in my photos my mark II has the metal bowl I just haven't put it back on yet.
The Mark III of which still escapes me.
[Linked Image]
This is the one that got away from me,I almost had it (Bugger).
[Linked Image]

I hope this helps.With what you are creating.

Here for a good time,not a long time.