Hallo,
I am working now on the cabane of the three planes, I have placed the central MG on the Coppens plane and I was looking for visual clues about the MGs of Scaroni and Michetti.
In this photo, portraying Scaroni onboard of his plane:

the Vickers 7mm on the left has not the usual lever (unjam lever?) on its rear part, but as you can see in this magnified detail

there is a sort of rod going from the bullet feeding hole o a vertical lever on the rear side of the weapon.
The same appears in this photo taken at the Casoni airfield (home of the 76th Squadriglia for a while) of the Flavio Torello Baracchini (credited 31 victories).

So modifying the two MGs of Scaroni in this way and doing the same to the only MG of Michetti's plane appears as a likely hypothesis
In this detail I spotted the Aldis (or Aldis - like) gunsight which does not appear to be fixed to the cowling.

In this picture:

you see Leonida Schiona - 78th squadriglia - with his HD1 and again the gunsight appears anchored to the top horizontal tube of the cabane.
Therefore I will try to scratch two aldis and to hang them in this way for both the Italians.
I guess there was just one anchor point on the back of the viewing tube.
Any suggestion? Does anyone have any better picture of these 2 "variations"?
Thanks
Antonio