Thank you Ernie, here are some pictures about painting pieces:
I painted fuselage interiror: the Italian Macchi built HD1 were doped as usual with clear dope while the French built left the factory in Aluminum dope.

I painted the cowlings in metal, will cover them and all the external metal parts with the final coats of paint


The seats from plastic turned to wood


Other pieces to use in the cockpit: on the floor I repeated the linen/metal division and tried to make some dirty traces of the rigging.
The instrument panels are painted on the reverse side, the instruments are carved on the plastic and I don't like them, I will make 3 different IPs.

Here is the floor rigged and the frame of the floor painted wood.

The frame here was just laid over the floor to see how it looks.

I also made a drawing to understand how to create the tail structure...
More later... hopefully
Thanks for looking!
Antonio