L1669 Hurricane – Help need it, please

Hello to all

My father and I have decided to make our Hawker Hurricane sub collection (1/72). I have spent one month selecting all the Hurricane Mk I that we want to build (30 aprox),

The problem is that we have many doubts and we live far away from where we can make a good reaserch. We live in Argentine. I wonder if some of you can help us.

The first batch of aircrafts that I would like to ask are the L1669, L1750 and L1780.

These are the reason why we have included these aircrafts in our list.
L1669: First tropical trials Hurricane I
L1750: Fixed with the first cannon (20 mm guns by Hispano Suiza
L1780 (late L1780/G):fixed with the first British (UPs) (unrotated projectiles)

I think that the best way is starting to ask one by one.

Hurricane Mk I L1669
We would like to build her when she was at Martlesham Healt in 1939 prior to its depatch to Khartoum. There is a photo in the Francis K. Mason Hurricane’s book which I used as reference.

By seeing the photo and reading more books this is what we know and we do not know.
There are some thinks that I checked with our references but please feel free to correct me.

Colours Camouflage:
Upper surfaces: Dark Earth and Dark Green (¿B patern scheme?)
Under surfaces: The underside does not appear to be a black and white scheme. Rather, it appears to be a uniform light color; perhaps ¿something like Sky or Aluminium?. In the photo is clear that the serial (L1669) is painted under the wing.

Markings:
Upper surfaces roundels:¿?
Under surfaces roundels: Red/White/Blue (size: ¿?)
Fouselage roundels: ¿?
Fin flash: No.

Details
Fabric covered wings.
DH Three blade propeller
Ventral strake
No guns ¿?

We will really appreciate your comments.
Many thanks in advance

Kind regards
Santiago Hrubisko

I am going to sumarise the information that we have regaring the L1750 and L1780 and I will post our doubts asap.