thanks Many!
I forgot to mention two details:
In the butterfly picture, we can see two instrument on the struts, one is certeinely a mirror

I represented them, lovely details at the end in a model...

then I decided to represent the wing hatch in open posiiton , even in the pi it's clearly closed (but nothing says at have been always like that)
Why? two reasons:
First this hatch was done to give the observer a ebtter view posiiton; this details his original enugh to be represented in the model

in the le bourget museum restored Caudron, traps are represent like windows who could be opened or closed.

CSM represented this idea

but in the pictures with hatch in open position, those traps never appear

I think they were mounted or dismounted in the groud...
Seconf reason, to represent the hatch opeend, it's interesting for the model because it let possibility to see better the cockpit...

Xan