Perhaps this is a good time to explain exactly what the model is. There were two prototype PZL P.1s, P.1/I and P.1/II. Like many prototypes they differ in details and underwent modifications. The model is of the second prototype in its late configuration.

The first prototype in the original configuration with radiator under the chin.

P.1/I after the radiator was move under the fuselage.

P.1/II original configuration.

P.1/II with new rudder and and second radiator at the front. This is what the model represents.

Note the propeller blades were silver or maybe white but not black.
I am sure that somewhere on their website they that the aircraft was first natural metal and then later painted red and white. From photographs the first prototype seems to have always been natural metal but I have only seen photographs of the second prototype painted red and white. Anyway it clearly was red and white before it was modified to the version represented by the model and so that is the only authentic scheme for it.