Hi, this is the old Monogram PBY-5A kit modified to be a CA-10 operated by the Brazilian Air Force (FAB) as cargo aircraft.
This model is exposed at the TAM (today, LATAM) airlines museum, in São Carlos city, São Paulo, Brazil, along with several other models, including real airplanes (1:1).
Some in-progress (low quality, sorry) images.
Underwing holes filled with bits of plastic:
Some interior, and openings for fuselage gun stations covered with plastic sheet.
Covered and puttied opening on right fuselage.
The left fuselage has a rectangular window (and a cargo door, closed - I scribed the contour only).
Openings for nose turret and bombsight window also covered with plastic sheet.
And the actual thing:
Cheers!